Wooo introverts. I mean, I can be outgoing in particular situations (like around people I'm comfortable with. And I think I give the impression of being extroverted online because I get to use words instead of body language, which is so much more comfortable for me. Tangent). But the situations you described - like mixers and such - oh man terrifying. I think I identify with Buffy more than any other character on BtVS because I do feel deeply, but I'm more guarded about it. So I often find myself getting defensive of characters like her, because so many people tend to be down on characters that aren't open books (especially female characters - because male characters are allowed to be stoic and emotionally guarded but if a female character behaves that way than she's "cold" bah).

And don't even get me started on Xander in that episode. STAB STAB STAB STAB STAB.

That is my standard reaction to Xander. So.