This teacher sounds terrible, its hard to be believe this is how some people think how to inspire others... There is no right way to do art because art is an expression of ones creativity. You can copy others but then it wouldn't be you, now would it... You can look at other art and adapt to your art in order to grow but to abandon your own style all together is ridiculous. I say draw the way your comfortable
draw how you like, but if you plan on going to school you should have more skills than just anime. if youre doing art for more than just a hobby it helps to at least be able to do a couple different styles to show you know your fundamentals
Absolutely freaking not.
You are a gifted artist and you should draw what you feel comfortable in and what you think you do best. As long as you love to draw, that's all that mattered. Do what YOU want not what others want you to do.
I'm of two minds about this. On the one hand, especially in your free time, no, absolutely you are under no obligation to change your style to something non-anime. Art is hard enough without drawing what you really enjoy doing.
...on the other hand, there is some truth coming from the folks saying you need to be able to demonstrate a range of skills if you're applying for an art program. They want to know that the person looking to enroll is open to a broad range of learning, and being tied to a particular style gives the opposite impression.
Many art teachers have the reputation of hating anime because they have heard too many teens/young people fall back on the defense of 'But it's my styyyyyyyle!!' (often a cartoony or anime style) as an excuse to not learn the hard, fundamental concepts of art, like anatomy, light and shadow, composition, proportion, etc. because that stuff is 'hard and boring and I just want to draw my OC'. Those artists don't understand that trying to learn some of that stuff solely within the bounds of a specific style is going to make learning those concepts harder, because the point of a 'style' is that it deviates from reality. Knowing how to draw something in a way that most closely mirrors reality will make it easier to translate those skills into whatever style you want, including anime, and do it with intention and control. THAT's what a good art teacher wants for their students.
So, no. Don't give up your anime style. It's beautiful and it gives you joy, and clearly others love it too. But be aware that school will ask you to be open to learning and demonstrating other ways and methods, and filling a portfolio with nothing but anime will make them think you're not.
This is right, you should learn how to draw in different styles, different techniques and more, after all it's all knowledge that you'll find a way how to incorporate into your own work. Or even more, allow you to have more than a single flavor. If she encourages you then I don't believe as others have claimed that your teacher is "classist" or that their advice is crap, or desperately wants you to stop drawing in anime style.
Teachers don't want an art student to get stuck into a single style at the point of becoming it a terrible bad habit that would later affect not only your artistic interests, your learning process but as well to negatively encourage your comfort zone. Teachers DO see potential in their students, that's why they want to encourage you to learn more and to don't stick to one single thing.
Consider it as if you were taking care of a toddler, you'd like the toddler to try a new yummy food right? Instead of them choosing the same 3 meals over and over and rejecting with utterly disgust to try something new maybe because it's red, it has a yellow sustance or because the "chicken" doesn't look like chiken.
As someone who has been in a High-School oriented to Visual Arts, attempted to become an art teacher (But due to times and distance I had to drop it), you need to know the following thing:
An artist that doesn't know how to do more than a single style, closes their chances of becoming a professional that can work in any field of their liking or in any field that requires someone to work, basically, if you need an art related job later, knowing to adapt to any kind of work that comes your way would be better than just accepting works based on what you like or that you know how to execute due to an over-fixation.
As well, when you're a student you'll have to learn even the things that you don't care about or that you don't like, different art styles, art movements are also part of it and you'll need to learn them even if you're gonna use them or not, just like Math or the approximate amount of red blood cells on our body.
Most of the time, as teenagers feel more accutely to what are being told to them, I want to make a mention that encouraging you to try something different doesn't mean you should stop doing what you like, nor that it's wrong, bad seen or it's unprofessional. Consciously, you know your teacher means well and as an educator, they want you to learn. But at the same time, keep in mind that emotionally, you'll think they are telling you to reject anime, when maybe it is not your teacher, but you yourself closing up to the idea without being conscious of it.
What you should ask yourself is what are you expecting to do once you finish school, where do you want to go, what do you want to do with your art, do you wanna live from it or keep it as a hobby, what kind of works related to your current abilities do you want to achieve, etc.
Not changing your style won't "ruin" your chances of becoming successful in the future, please avoid being overly dramatic. Not changing your style will only limit your abilities and slow down your learning process, as well, in some cases it will limit job opportunities. Not to mention, there are elements from other art movements/styles that you could incorporate into yours and to continue developing further more your style to make it more iconic or "original" as some may say.
The moment I saw the topic's title I knew it was about a teacher telling someone not to draw manga/anime style. 
Sad to see nothing has changed.
Your teacher wants the best for you, but may not understand that the style you're working with has the ability to bring you success - but it heavily depends on what career you're looking to go into.
If you're looking to go into fine art, editorial and maybe even children's book illustration, having an anime style may not be the right way to go. If you rather focus on comics, game art or animation, your current style could be just fine.
So rather than focusing on playing with styles, think about what you're looking to accomplish and what career interests you - checking out successful artists in those careers will give you an idea into what direction you should grow with your skills and style.
What you should do is research the schools you want to go to, as well as careers you want to be in, and find out from current students/alumni/working professionals whether anime style is something that they think will hinder your career or not. There is absolutely an old-fashioned attitude that dismisses anime-like art in the art world - but whether it's something you need to care about or not is dependent on where you want to end up. Some places it will absolutely close doors for you, and others it wouldn't matter.
Also, critically analyze whether you've ever used "but it's my style" as an excuse. I've never been to art school, but some of my friends are professional artists and art teachers and they've definitely had classmates and students who would, for example, refuse to draw anything but sock feet because "it's their cartoony style", while in reality they just didn't like/didn't know how to draw toes. In those cases their teachers would be absolutely in the right to tell them to "change" their style.
sounds like my highschool teacher. told me that art is not a career. comics and animation is a useless job that is only for hacks and i would never get into so i should give up now...
nothing new here 
tbh this is deliberately universal that art teachers really dislike cartoons and see it as garbage. (there are probably ones that dont act like this but i havent seen it) take what they say about it with a grain of salt. if they want to teach you the fundamentals, sure but if you decided to use that to draw in a more cartoony or anime way, then thats your choice.
Right. I hope the teacher isn't saying to abandon the anime style but to add to their "bag of tricks" so they can step into more & different types of work & do them well.
The point is, anime-style is stylized drawing, before you can go to stylized, first you need to be able to draw realism and master anatomy drawing, in other words, stylized drawing is the next level after you master the realistic drawing. And who is the audience your drawing targeted to?
If you're planning your drawing targeted to younger and adult teen audiences and can be accepted around the globe especially in Asia then anime and manhwa style is preferable. If your targeted audiences are adults and older adults then realism or semi-realism is preferable. In my opinion.
Your teacher is right. You should try more styles, especially realism. That doesn't mean you should drop anime style though, you can always draw as much anime style as you like, but only pick a few for your portfolio. Your portfolio should include other styles too, mostly realism.
You can still draw anime style art, but I highly recommend learning to be flexible. I've been drawing manga since I was a teenager, and early in my career, back in the 00s, most of my paid work was manga style. I'd been a finalist in the Tokyopop UK and Ireland Rising Stars of Manga and placed in the Manga Jiman competition (a manga competition still run by the Japanese Embassy in London), and manga was booming at the time, so I could pretty much be a full-time manga style artist on commissions and manga workshops....
But then came the "great manga crash of 09". Tokyopop imploded and Manga became incredibly unfashionable for a few years. Terms like "animu" and "weeb" being synonymous with bad art on places like Tumblr in the 2010s. Plus the UK voted in a conservative government, so schools and libraries no longer had the funding for something as frivolous as a manga workshop, meaning I needed to look for other income streams. It was basically evolve or die for me. I learned digital painting and 3D modelling and did a lot of painted and modelled game art during the next ten years, and the vast majority of my comissions were in a more generic cartoon art style. At the end of the 2010s, thanks in a fairly large part to the popularity of Korean webtoons, it finally started to become a bit more acceptable to draw in an anime-influenced art style. Errant, which I started drawing in 2019, was pretty much the first thing I'd drawn in my manga style in ages (which is why the early pages look a bit more like an indie comic than the later ones). My outside commissions mostly still aren't manga style though.
So... don't throw away your passion for manga, but if you want to go pro, like seriously make a living and a long-term career as an illustrator, games artist or comic artist, it's a good idea to be flexible. Fashions change, the products people use art for change, the kinds of comics people read change and a lot of comics work in countries like the UK are licensed and require you to work to strict style guidelines. You can have manga as your personal default signature style, and maybe if you're lucky, that's the style you'll make money from and it'll be awesome, but it's a bad idea to have "luck" as a vital part of your business plan.
Well most people gave answers already, but I wouldn't abandon your art style. If you are forced to draw in a style you are not comfortable with it'll impact you negatively.
That said, it wouldn't hurt to try and look at other styles, not necessarily to draw but maybe to learn from them. Like if you struggle to draw anatomy related stuff in your art style (not assuming you are) it might be worth it to do a bit of research in art that does these things well, even if they are not anime. And even in anime there are a lot of varied styles if you know where to look
I disagree with several people about your teacher. I think she is giving you sound advice. Part of pursuing any sort of craft or profession is becoming versatile and having a wide understanding of it. There's nothing wrong about drawing in a specific style in your free time, but if you pursue art as your profession, you should definitely change your style (if it is mostly anime).
I would advice getting into realism, and then branching into different fields. In the end this would strengthen your anime style illustrations and you will be incorporating what you'll learn from different styles and mediums.
Anyways, I think your teacher is giving you a great advice.
Most artists working have to draw in multiple styles, depending on the project.
getting to draw in your own "style" is a unique thing on the internet, and getting paid for it is rare. I mean. its why were all trying to make our comics.. 
I think you should 1) continue to draw in the style you love and do that for fun as often as you want
2) don´t draw in any style when you train/practice whatever you call it and just focus on reference,
construction, the technical part of drawing, perspective, proportions, gesture
Maybe that´s what your teacher is talking about and I think it´s good to forget style completely when
you are training
Style is also something I wouldn´t think too much about or not at all because it will come automatically
when you are drawing sequential art, technique and understanding will not come automatically and
must be trained
From my experience, If you're style is effective, developing a stronger and broader foundation will just make what your doing more sustainable and applicable for more opportunities. Personally, I have been told I have a style despite developing skills in realism, cartoon, and urban graphic style. (take Consideration my quality of work before taking my advice)
I do know often times portfolios aren't based as much on how "good" or "skilled" the applicants are. It's more about how they would fit for the type of projects. Most of the successful engineers I know have an above average foundation skillset in many areas of their field. We just see their pursuit of projects that they are most experienced fit in. I imagine art is very similar.
I'll echo what a lot of other folks have been saying here about drawing how you want. Being passionate about your art is one of the most important components of being a professional artist, and one of the best ways to tap into that passion is to draw things for yourself sometimes, like drawing things in an anime style.
BUT. I want to float an idea to you, as a fellow artist that started out drawing anime and was told by teachers to stop. Starting out in a stylized art form hurt my fundamentals. Professional anime artists don't just draw anime. They do real life studies too, because there are fundamental and essential art skills that only real life studies can teach you. Things like proper lighting, shape and form, anatomy, perspective (particularly things like zoom lens perspective vs close lens perspective), foreshortening etc. etc.
Anime is a stylized interpretation of real life, and it relies on an understanding of that core structure. I think about offsets a lot in art. An aesthetic is just real life with some particular offsets applied. When an artist's anime technique looks refined and skilled it's because they've referenced real life and then translated it into a stylized form. When you start from a stylized perspective, it's just an interpretation of someone else's stylization, and you won't grasp what things to exaggerate, or the core structure underneath, because you don't have the fundamentals down. You won't understand why or how to properly draw it.
Again, I started by drawing anime when I was younger too. It's the reason I got serious about art in the first place. BUT my resistance to drawing things from real life stagnated my growth, and saddled me with some bad habits that were very difficult to break.
So I guess what I'm saying is that studying real life will give you a deeper understanding of anime. Which is what you're striving for anyway, right?
Draw however you want. Be open to other styles, as you'll have to learn them if you go to art school, and it does help in the long run. But your style is your style. Don't let anyone, and certainly not a teacher, tell you you have to draw differently. I didn't go to art school for college, but I had a very encouraging art teacher in high school who couldnt have given two shits that I was drawing anime. All she cared about was I was doing SOMETHING creative and that I was developing a style to begin with.
To be honest, this comes up far too often. "Anime isn't art" "you're not a real artist if you draw anime" "you're not allowed to draw anime if you're not japanese" "you're not in japan, so your art isn't actually anime." Like my god, shut up already. Who are these people to say what's art? It bothers me so much when I hear this, especially when it comes from art teachers of all people.
