Funny, when I was a kid, that's all I ever wanted to be too, an actor. Not for fame or glory, I was too young to know about those things, just imitatating, "being" someone else always was fun. I did and think I do good imitations. LOVE trying to imitate different accents (just check out the "let's hear you voice thread" or something."
But I think an ENTP would be a total natural at acting. Their ability to improvise socially is very high I think.