I thought it would be uncomfortable, but when I got there and started to focus on drawing it was totally fine. Probably the most awkward is when you first get there and they take off their robe, but really was less uncomfortable than I expected
You get desensitized real quick.
I thought I'd be uncomfortable since the model we had was an older man, but he was a really great model. He could hold some difficult poses for a long, long time!
I took a life drawing course when I was 12, it was a little awkward at first, but you focus more on form by the end of your first class. When I got older, (early 20's) same deal. There's actually youtube channels where you can get introduced to the idea of a live model/drawing session.
AND -- I hope your future school course doesn't belong to a for-profit college. Just saying.
i started life drawing when i was 14 and never thought it was weird mainly because i was trying to draw gay porn since i was 12 years old. drawing from life just seemed really tame. Its not like they are posing in a particularly sexy manner. they are just naked.
as for attractive models, the fact that there are like 15 other people in the room will usually make any awkwardness evaporate and you just get on with your lives and draw.
No, not really.
I mean, it's a bit awkward for the first 10 minutes or so, because hey, there is a naked person in the room, that's unusual - but once you actually start drawing, that awkwardness goes away.
You stop looking at them as a naked person, and start looking at them as a collection of shapes and lines and angles. You won't be sitting there going "Uwaaaah genitals!!!!" - you'll be going "right the angle of the shoulders goes this way, and the angle of the hips that way, elbow goes there, oooh look at that radial bone", etc.
At least, that's how I've experienced it all the times I've done it. After the first 10 minutes of getting used to the idea of drawing a naked person, it's no more or less awkward than, say, drawing a house.
Based on the classes I've been in, no, not really? I've had a wide variety of models of all ages and genders, but even when we had quote-unquote 'hot people' modelling for us, there wasn't any blushing going on in the rest of the class.
And even if there was, it wasn't really a big deal?
to be honest i kept getting in trouble because i would let my imagination escape and would start drawing wings and tails and horns on figures. on the whole i use to enjoy life classes and studying muscle structure , sadly i fell out of the practice in time and lost most of the skill and that's my advice peeps never stop practice it's amazing how quick things can get lost.
I took a figure drawing class a couple semesters ago and it was extremely helpful. Once u get past the nudity and get into the drawing you really forget you're drawing a naked person at all. I'm not afraid of boobs anymore after that class lmao
my art teacher never forgave me for skipping life drawing...
ive heard some really awkward stories from it, sure, but mostly people say you totally forget the persons naked, youre just drawing.
there are clothed life drawing classes out there, though, i think.
When I took the class, there was a nice looking dude the first day, I was like, "This wont be so bad! > w >; "
He only show up a few times after that. Mostly had Skip. Skip was an old man, but a really good at doing his job. There are some crazy stories I don't know if I should talk about here. XD
But over all. It's just like drawing still life drawings. you have something you have to draw in-front of you to draw so you do it. It never really bothered me.
I've considered taking more classes at the local art place here. If only I had more time and money.
The only way it's awkward is if you (or sometimes the model) make it awkward. Usually in all my life drawing classes you have a model who knows what they're doing and are excited to get up there and help artists draw. I think my fave nude model was this kick ass tattooed lady who was like 7 or 8 months pregnant. It was neat to work with her, because 1. you rarely get to draw the nude pregnant woman, and 2. there'd be moments where you were drawing and suddenly the whole room would GASP because the baby would shove it's hand or foot against her stomach and you could SEE it move! It was SO cool :o
As others have said it's weird at first, but then you really do have to grow up and focus on what you're drawing and not the fact there's a naked person in front of you.
AH crud i accidentally deleted it XD now im rewritin it
i was pretty much sayin it was awkward at first tho. til like 10 min and it got more normal. but then theyd bend down to pick somethin up and you'd see somethin new and itd get weird all over again. but im pretty sure i was the only one tryin not to giggle so it was probs just me. and it does help boost up drawing skills
I had a person in my figure drawing class run out as soon as the model removed his clothes. Apparently he was really religious or something and I never saw him around school again. It's really important though! Nothing beats practicing from life.
I remember my first life drawing classes. There was no warning. This older but well built dude just strolls in. gets butt-naked and my professor is like alright you got 20mins. At that point I figure everyone was too focused trying to draw to be bothered with this guy's junk just hanging out. My professor had to critique me 5 times on making his junk look too big.. and had to hold up a ruler with her thumb to my drawing and then to the model. Good times 
Point is if you're an artist, you'll get use to it. Just be mature about it. It's honestly the best way to learn.
At first, drawing nude models was kind of a very awkward idea for me, but it was required in both my basic drawing and basic painting classes in my course. At first, I thought it was going to be like being in a strip club watching naked people for a prolonged period of time (normally like 4-8 hours for an average drawing session), and what if "something" happens while doing so. However, what I found was that, as long as you're seriously focusing on the work at hand, I tend to forget that there was any awkwardness at all. It might sound dehumanizing, but as soon as you start drawing the model, all sense of the human person is stripped from them, turning them into nothing more than an object to draw, however, your job as an artist to to return their humanity by communicating it into the medium you're working with. As you fulfill the purpose of them being the object for your sketches, they become human not just as themselves, but also on the canvas of your art. I've felt the same way after doing it 3 times and I gotta say that it's such an amazing experience 
Just don't look too deeply at their junk regardless of gender, that gets weird after you draw (I spent a good 15 minutes on 2 occasions trying to perfectly draw both a pair of boobs from a woman and a penis from a man) ^^"
9am Monday morning, freezing cold, I got to the class late and just grabbed some paper in a rush, set up my easel and unpacked my charcoal, only then did I peer up at the model, who just so happened to be 3 metres away from me, spread eagle, knees up at her sides, her squiggy bits pointed straight at me. It may have been the shock of the moment, but I can't recall whether it was her or me who was more awkward in that moment.
The other funny moment we had was when this model who we'd never had before unrobed and he was hung like a donkey, I'm talking long and thick, despite how cold it was. There was this one girl with bright scarlet hair and skin like white porcelain who turned so red it only brought attention to her and made her even redder. To make matters worse, when we saw what she'd drawn, all the lines were clean except where the junk was, which was a dark smear of charcoal where she'd rubbed it out and redrawn it again and again.
Good times.
It's pretty interesting and fun. You can even simulate the experience with plenty of sketch websites out there that will give you the opportunity to draw a variety of live models in a number of positions. The in-person experience is usually richer, I find, but may not suit your tastes; you can always try sites that specialize in this to get used to the idea.
The most common problem, I find, is that some people conflate nudity with sex or sexuality, and the two aren't necessarily ever related.
In college I had drawing classes with naked people and it's completely normal!
Many people have asked me if it's strange or awkward in any way but I always said it's pretty normal.
It's like you're working on something and you're focused on your drawing. You're not really thinking " omg this person it's naked in front of me" x)! You'll be calm and focused drawing the person as you we're if it was a basket of fruit !
Ok probably on your first day you may be a bit anxious but the next days you'll be pretty fine in my opinion!
Those classes are pretty helpful to train your drawing skinlls and to learn Body Proportions and Anatomy :)!
Good Luck!! 
ok i will add this funny but true tale...
when my big brother found out i was taking life drawing classes he asked if he could go along ( something i found highly strange as he cannot draw for toffee) I had thought worked out right away what he was up too and as it was an open class i knew he could tag along. he was so disappointing that the model was a guy (yes i knew that upfront too, i'm a mean little brother) needless to say he never asked to come to any art class again, non arty people just don't see the world like the rest of us.