I have always been attracted to women, but have been with men. Hopefully, should I fully transition, I'd still be attracted to woman, so I'm currently straight/bi and would be lesbian/bi.
Incidentally, it's because of my cross-dressing that I first had experience with other men. A friend was helping me with cross-dressing and she asked if I had ever considered a sex change (as it was called back then). I replied I had many, many times, but I would have to be a lesbian, as I didn't have an interest in men. She suggested I give it a try with another guy and I did. I then realized I enjoyed it and wished I had started sooner, but I'm still mainly interested in women. I'd love to have a threesome with a couple, but that never happened.