The reason some of the older members of this site suggest you do a search is mainly because these questions have been discussed a great deal on here before and there's no point in creating tons of threads that all deal with the same subject. Just about everybody who turns up here has asked themselves the exact same thing at some point so you're not alone.

The thread that might help you most is this one:
http://forum.transladyboy.com/showthread.php?t=3835

But the general gist is - you are what you believe yourself to be, everything else is just labelling Oh, and don't feel guilty about what you're attracted to.