One more thing today .... I am endlessly fascinated with Meyers Briggs and enneagram tests. Have been for years. I take many of them. I sometimes find the questions very hard to answer - I almost think you'd have to have a physcological evaluation of yourself by someone qualified to even know how to answer some of them. But I found a different site last evening - the questions are much easier to relate to - I thought it gave a very good assessment.
If you love these tests, give this one a try - it is free although you do have to set up an account with a password.
I am an INTP although I come out equal on the introvert/extrovert category so could be an ENTP. I know deep down I am an introvert with occasional flashes of extrovert. I find the extrovert side very wearing, I also find if I don't occasionally act out the extrovert side, I start craving the social whirl.