So, I didn’t get the first part of this, but I think I get the gist.
I’ve actually felt like this at certain times in my life, and in my case it was because I had so little experience (i.e. none) with The Penis that I found the whole idea of it somewhat repellent and it didn’t enter into my sexual desires or fantasies at all, so those all became focused on women (or men who mysteriously had no use for their penises in my silly fantasies). I don’t know if that’s the case for you but it’s something to think about, I guess.
All I can really say is that sexuality changes throughout life for a lot of people, so what you feel now is unlikely to go on forever. When you’re really attracted to someone, it’ll usually be both sexual and romantic, even if you’ve never had those feelings for someone of that gender before. People can surprise you. Your own attractions can surprise you.
I would also add that if you ever do decide to have sex with a woman, and she’s a woman for whom your feelings are purely sexual as you’ve described, then you should disclose that to her. Tell her about your tentative heteroromantic/homosexual identity. Let her decide whether or not she’s okay with sleeping with someone who feels that way. She may not be, but it’s better to be open about it than to use someone for sex under false pretenses.
Best of luck in figuring your shit out, babe. I have faith that you can do it, because I was the most confused person in the world and I managed to do it!