In many ways the big questions for any one of the members here are -
1. Where do I fit on the transgender spectrum?
2. What does this say about my sexuality?
For the first I believe that there is no definitive answer, except once the decision to transition has been made. A crossdresser could shift on the spectrum depending on the need to dress or the motive for dressing.
The answer to the second question depends on whether the individual views themselves as male or female at the time in question. Many transgender people are attracted to the gender they desire to be and logically should be regarded as homosexual, on the same token a trans person who is attracted to the gender they are "rejecting" should be regarded as heterosexual. Why do I state this when it is contrary to "normal" thinking? The answer is that I am referring to how that individual identifies themselves (regardless of whether it is in a single moment of clarity, whether it is a repressed desire or simply how that person views themselves). When I present as Sara, I am 100% Sara and I act differently from my "everyday drab" male self - however I am still attracted to women, so therefore Sara is (or would be) a lesbian but my male self is straight.
Of course as with most things in life this issue is neither black or white but varied shades of grey so you are correct in saying that we are what we are. The real question should be would you act on these desires.
"Denying who you really are, only leads to regrets later in life. Seize the moment because it will never come around again."
I have been reliably informed that I am a much bigger bitch when I am NOT Sara!!!!