Every MBTI test I've ever taken has pegged me, hard, as an E in ENTP. Except for the last one, where it was closer to "I", but still an E.
However, there are some real issues...namely, I dislike people and don't like being in crowds. I don't go out of my way to socialize with people, don't talk to people just to talk to them...in fact, people who try and talk to me (like in line at the store, whatever) irritate me.
I prefer reading books to going out. Staying inside and reading during a vacation sounds just as fun as going camping...away from everyone. I don't generally like parties unless I am going to know most of the folks there, or at least a handful. Introductions to people by people I know...I'll talk to them for a bit then continue if I find them interesting or find something else if they're boring or irritating.
So...is it possible to be a Misanthrope and an ENTP?