Hi,
Um wow that is a really confusing situation you have there, personally I have always thought that it is just a feeling you know who or what you are. It can take time to figure it out and to be happy with it but ultimately its a feeling.
A lot of people think that you need to try it out to know for sure but I have friends that have not “been” with either male or female and still Identify as lesbian/gay. Personally I have never “been” with a female but am happily a gay male. I just kinda new, I dated girls when I was younger but never quite had the same feelings physically and emotionally as I do with guys.
I’m no doctor and have no idea how hormones would effect how your emotions are towards same or opposite sex but I still think it would just be a feeling you would know if your not straight, but at the same time you don’t have to box yourself there are so many facets to sexuality and gender identity you don’t have to fit into any one clearly defined box, so long as you are happy with the person you are that is all that matters.
I hope I have helped in some way and not just opened up a Pandora’s box of more questions