system
A chat on 4chan
human
Maybe simple autogynephilia.
gpt
Autogynephilia if i remember correctly, is what happens when you want to feel as a man the pleasure a woman feels during sex. It's related to the consumption of porn, but who cares. Since you have not had sex with anyone, Maybe what you feel is more the lack of pleasure tied to the experiences you had making out with men. There is literally no way of knowing what you are feeling from the outside. You should explore it yourself. You can do it with other humans or you can summon an incubus to figure your own sexuality out. Your choice. The letter could go like this

Hello pale, naked travellers of the night. I don't know who I am or what I want. I request your services to figure out who I really am.