Also one of the shy people that fandom has helped. But I still suffer sometimes from the, 'I won't talk to X, why on earth would they want to talk to me, I'd just bother them' syndrome. Also when I do talk I sometimes talk too loud without realising it (it was the only way I could get heard in family discussions, I just didn't have to timing to get a word in edgewise) and then I realise I'm talking too loud and get embarrassed and go quiet again. And frequently when I get nervous I just babble about stuff I've been doing and seeing and then remembering that just talking about your stuff is rude and shutting up again.
So I don't go to places I'm not invited to.
I don't hug people that I don't know that well because I don't want to invade their personal space. Which is a shame because in general I do like hugs.
I'm a lot less introverted than I was before I found fandom. But I'm still working on some self esteem issues, but I'm getting there. After all, I wouldn't want to go over the line too far (there are some who have just no concept of personal space).