How do you know if you are gay or straight?

I mean I have never been interested in men (I am a female), but at the same time I have never been interested in women either.

If I am not attracted to either, what does that make me? A mutant?

I've tried dating guys a few times, but it always ends up with them getting mad because I am not "physical" enough with them (I will push them away from even kissing me). I have never dated a girl on the otherhand (I was always taught that that was "wrong" growing up...my parents were far right-wing...but I am not so sure now).

I have a problem with female doctors for some reason unknown to me...I just prefer males...so maybe that means I am straight, I dunno.

I don't want to spend the rest of my life alone. I'd like to have somone to spend it with, but I just don't know enough about myself to know what I want.