I know, it's called Extraversion for something but... today I was searching through the types for seeing which would fit better some characters, and giving a deep look into the ENTP... I think it describes me very well. I sometimes think I'm more of an Ne user than a Ti (despite I score very high on both), and I really really dislike doing things just 'because I should'. I also love arguing and 'playing' with other people's mind's (there's nothing funnier for me than when I tease my ISTP friend), but only when I feel just like that.
I'm also like a INTP, geekly and stand-aloneish, and like to analyze things.
I wouldn't worry too much, but I'm sure that part of my Introversion comes from social anxiety. Maybe it's just a psicological issue that inhibits my Extroversion? I do admit that sometimes I like being the center of attention, but also like to watch things from an outer perspective.
Also, I noticed that I try to overcome that 'social anxiety' by acting like a fearless Extrovert. If they know about MBTI in my school, they would type me as an ENTJ, for sure. I try to cover my fear of rejection on being like a nazi (the kind of girl who yells 'WHAT ARE YOU DOING, FUCKTARD?!' when someones try to tease me), but also have 'charmed' other people by my quick wit and that I'm not scared of anyone (in theory). Even, someone told me that I 'was cool because I always say what I think about other people'.
Could I be an E, after all? I don't know... I always feel insecure about other people. Even right now I feel afraid that I'll look like an idiot by posting this and probably I'll regret this... but I'm curious.