It's a constant back and forth.
I do a LOT of PR work so there's an expectation of being extroverted and being the lead in many conversations and I'm the loudest and most active person at my college, but at the same time I'm the kind of person who'd call off a dinner date with friends because it means leaving the house, especially if there's going to be people I don't know. Hell, when I go the shops and I'm not on the job, I rush in, grab my stuff and leave, with only a few grunts to the shop clerks.
Guess it really depends on who I'm with.