What is a "normal" person?
You keep mentioning them but I don't quiet understand who they are.
I think that we do what we do just because it make us happy. When I draw, I feel soo good that I forget the stress. I was also worry when I hurt my wrist haha. Drawing is my life. It's a feeling so good that we want to share what we create with other people. That's why I think we create comics. To share the awesomeness of create :DDD
I do it because I love my characters so much. I want to get their stories told and I'm fortunate to have found a medium. There's no deep lesson or aesop in their stories (and those searching for one will be shot a la Twain), but at some point in development you grasp the depths of a character's heart, and then telling their story and revealing that heart to others becomes an obsession.
Heck, sometimes I get that same feeling reading other people's comics. I like to think that maybe the writer got the same feeling for their character as I do for mine, of holding onto some precious soul. When I find that in a character, you will never find a more ardent fan than me.
I do it to channel in all my teenage angst.
Opportunistic plug.
Yes, this. I can't not create. It would be like trying not to breathe.
I have a compulsive need to tell stories, and a great urge to draw. Trying to hold it back would make me desperately unhappy.
When I was young, comic art inspired me. I'd like to be that inspiration for someone some day. No amount of money or subscribers can top that feeling of when you've inspired someone for me.
Trust me, normies exist. I know plenty of them. They wake up, get the kids ready for school, go to work. Come home, eat dinner in front of the television, send the kids to bed, watch some more television with a quiet drink, then go to bed to start it all over again.
Normies, in my opinion, are in need of a hobby.
I ask myself this question at least every other day. If I didn't create something, it would seriously hurt my brain xD! Then I wouldn't be able to get my story out there, it might as well not exist all if I can't create a visual manifestation of it!
"normies" ... gosh darn those conforming sheeple non artists...
I just do it because I can. I do a lot of things because I can. I don't get super emotional about my work because it's just something I do either for fun or for a job. It's not my life blood. I'm not going to die if I don't draw. I care about my work, but I'm not acting like it's something magical and sets me apart from anyone else.
I do it just cause I love creating! I have a lot of fun drawing and making comics, and it makes me happy when other like them as well! =D
Then.. Why do we writte novels? Why do singers sing? Why does the dog bark so much? We do it because we want, and we have to, otherwise our brains would rot. If I spent a day without imagining what happens in my comic, without telling the character story in my head, that day I'd be dead, I cannot stop paiting the character's lives on paper or thinking about their life, is just something that happens.
I'm not gonna lie, considering the fact that I grew up in a very less than desirable environment and family, if it weren't for Time Gate acting as a creative coping mechanism throughout my childhood and teenage years, I'd be dead by now. I know I'm usually cheeky about those sorts of things but it's 100% true.
-As someone that used to pump out one drawing a month, it forces to me finish about thirty-forty in a week.
-The comments. I ALWAYS wanted comments on my artwork but I never got them, but when it's a comic, you're bound to get a lot more every time you update.
-Giving my life a purpose. If I don't have anything to do, I don't waste it, I use it to draw, so when the summer is over I don't feel like an empty shell that accomplished nothing.
-Getting used to coming up with a narrative and creating characters, and learning how to get around creative obstacles.
-Something to show to a future interviewer if I'm going for a creative job.
Loving all the replies so far! 
Actually, I kept calling non-cartoonists "normal" just to be sarcastic. Truth is, NO one's "normal", despite how often some folks insist that they are! I love making cartoons, but I also love READING them, too! So I'm always on the lookout for your material!
The primary reason I started making comics was to force myself to produce art on a regular basis. I obsess over every detail of my traditional art and I'd typically get stuck on a single piece for months. Then I'd feel like shit for not getting anything else done. Enter comics. For me, they're not super serious, so they don't need to look perfect. I post twice a week, so it's cool to look back and see how much I've gotten done. Even if my comic style is drastically inferior to my illustration style, progress is progress.
The secondary reason is because I have so many little ideas in my head that won't go away until I spew them out in a strip. My imagination is always throwing random stuff at me all day, and comics are a good outlet. I love reading comics, so it's awesome to create stuff that other people potentially love as well. I would make them either way, but it's a major bonus when people look at them and think they're funny and relatable, or weird and cool.