Depends.
Do you identify as male, or mostly male? Or as a male that likes to dress like a woman, but still a guy?
If you do, and you like only men (or even just mostly only men) in a sexual, emotional, and mental way, then I'd see you as gay. Others might, too. It really depends on your perspective.
If you do, and like only women (or mostly), then you're straight. And then there's all the other genders to worry about...
If you identify as female/mostly female, or as a transsexual woman, and only like men, you're straight. Only women, gay (lesbian). And of course, there's all the other genders to worry about...
From what you've said, I'd say you're a straight guy who likes to crossdress! But of course, it is YOUR identity and you usually have to think for yourself on that. Remember, though, crossdressing doesn't make a person gay.