Firstly, I'd recommend talking with a therapist that specialises in gender issues, you may or may not be trans, the therapist will help you work that out.
Secondly, I think you are looking at it the wrong way.. Put aside the physical and take a good, hard look at who you are on the inside. Then you might get some insight about yourself. Also, gender identity and sexual preference are 2 different things, you may even find that your preference changes if you decide that transition is for you.