I'm much more introverted than extroverted.
I like having a small group of close friends and when I'm with them, I could yap on all day. But when I'm with a crowd of people I barely say a word.
At university I live in halls of residence and on my floor there are 17 other girls, and I barely see any of them because I don't really go outside of my room unless I go to the bathroom/kitchen/lectures. At one stage they actually contacted one of the mentors because they thought I was ill as I barely leave my room. xD It's not that I don't like to make new friends, it's just that I feel we all have nothing in common; the biggest difference between us is they like to go out boozing practically every night and I don't drink at all. I struggle to find like-minded people. But I actually don't mind my own company.
I'm usually the more thoughtful and quiet one in my group of friends. I tend to be the more "mature" one that people come to talk to. (Although, sometimes it can feel like that it's all they come to me for!) But I do get very talkative with my little group of friends, with a sense of humour that only I get, but they know that's just my style.
I think the most extroverted thing about me is that I can be very opinionated. xD