I think a lot of people have the wrong idea about introversion, or at least the word "introversion".
Introversion means you naturally lean toward focusing more on your inner world of thoughts, feelings, and ideas instead of in the outside world.
Introverts tend to naturally gain energy in quiet, comfortable places while alone.
Extroverts tend to naturally gain energy by being around lots of people going about their business in the world full of sounds and external stimulation.
The reason why some introverts tend to be socially awkward is because they focus on their internal world and this usually doesn't sync very well with the actual physical space around them.
Some introverts can be as loud and talkative and outgoing as any extrovert.
Vice versa, some extroverts can be very quiet and reserved and spend the majority of their time indoors. The difference is where their energy goes and what they tend to focus on, and how their surroundings affect them overall.
How they were raised also has an effect on their socializing level. Extraverts can be as riddled with anxieties as introverts.
Nurture is many time an impediment to nature, especially when the "norm" is to be outgoing.
The extreme introvert wouldn't be able to handle being outside for too long (it's too energy-draining), and the extreme extrovert wouldn't handle being indoors for too long very well.
In these cases, where they are outside of their natural zone, they tend to get really tired or depressed.
I think this is the case with a lot of teenage introverts at school.
For me personally, I love talking to people one-on-one and I enjoy being outside when I'm with my close friends. If I'm in a loud environment with a huge gathering of people, I start to lose vigor very quickly and become silent. So I prefer traveling in a small group and for a limited amount of time.
To actually answer your initial questions (lol):
I am very much an introvert. I used to be socially awkward when I was younger but I learned over time the social niceties required for smooth face-to-face human interaction.
I think I fit quite nicely in this industry. The art world is full of introverts like me so I don't feel very out of place. Nothing really stops me from trying to reach out and talk to other artists/human beings when I think it's acceptable to do so.
I think being introverted helps greatly with the comic making process. I don't step outside of my house at least 5 days a week and I'm totally fine. This allows me to sit down and draw more comfortably than if I were extroverted and wanted to go outside all the time. I think my natural introversion suits the comic making career.
Working as a waiter was a horrifying experience though, I can tell you that. There was no end to the lunch rush......