Hi Frankie! Welcome to WP.
You can call me Unicorn or GMU, I don't really care. I only joined up a month or so ago, for the same reasons. I can definitely understand the whole "nobody understands autism" thing, I've had it ever since I was diagnosed and even before. Especially for girls it's really hard for people to understand the difference. It's nice to have people who understand and who you can talk to without getting confused by facial expressions.
I also enjoy digital art (aka getting perfectly lovely old paintings and combining / mutilating them). I'm currently making Christmas cards using old ones I find on Pinterest. Are you working on a project at the moment?
By the way, it says under your username your age and gender, I think you can get rid of it by editing your profile. However, I would encourage you not to be afraid of judgement, it would make us all awful hypocrites! We've all been there, feeling a bit awkward and like you won't fit in. But you will, this is a place you can be yourself (though my philosophy is to always be myself, and you can tell because everyone thinks I'm insane).