I don't think my scores on many of these tests are stable throughout different situations. I remember taking a Meyers-Briggs self-test and I ended up placing myself in the dead center of one of the dimensions scale. (I can't remember which one.) I no longer fit neatly into the introverted/extroverted category. I used to act like an introvert, and I'm still comfortable with solitary activities, but I'm far more inclined to talk to strangers than most people I've met. (This is, at least in part, desperation.) I also like performing, usually don't get "stage fright", and am generally comfortable with being the center of attention.