If she identifies as female, and you're attracted to her as a female, that would make you lesbian (or bisexual)
If he identifies as male, and you're attracted to him as a male, that would make you straight (or bisexual)
If he/she is gender queer, that's up to ya'll to decide what you wanna call it, but in the end it's still up to you to do decide what you want to call it.