Yes, welcome to Susan's!
I think you'll find a lot of people here who are just as confused about how to classify themselves.
And those who aren't are in denial!
(bah bum BUM) 
Certainly I'm here because I'm trying to figure out what I am, and what I want to be when I grow up. If I grow up; so far, I've resisted it for many decades.
Like you, I'm a straight genetic male. I have some guy characteristics (electronics & tech junkie), but not others (hate sports and cars, don't chase women). On the other hand, I have some girl traits (waiting to be asked, passive, love pretty dresses, etc), but not others (hate kids, don't like guys, etc). And I don't want to be a female socially -- at least not if I'd have to spend hours a day making myself look beautiful. Once in a while, sure! But 24/7? Yuck!
If I could go back to the moment of my conception and pick which sperm hit the egg, I would have picked one with an X. But given that I was dealt a Y chromosome, I've decided to play that hand rather than call for a new card. So far, anyway.
And most of my sexual fantasies involve being turned into an attractive girl and placed in situations where guys try hit on me.
Exciting fantasy? You betcha! But would I like the reality? Hell, no! At least I don't
think I would! Hence my confusion.
Sorry to go on so much about me, but I hope that sounds familiar to you.
One thing that puzzled me about what you said, though.
Quote from: r2073877i don't sexually fantasize about anything other than being taken, as a female, by a man ... I struggle because i cannot fulfill these fantasies.
I wasn't sure what you meant by that last sentence. Are you struggling because you want to fulfill those fantasies, but can't?