26 UK - At what point should I accept myself as Gay?

I've always considered myself as a Straight guy search for a attractive women to be my GF, fall in love have a happy and passionate Relationship then become married with a family...now things have changed. I'm confused to what it means but I have a feeling I know the truth...I don't think about women in a sexual or romantic way anymore...Only guys. Even when watching porn, Men are so much more attractive to look at and set my emotions and desires flowing! With a woman I’ve always seen myself as a Top-Verse But when I think about being in a sexual and romantic relationship with a guy, I see myself as only a Sub bottom. The more I think about it is hot and something I want. I wanna be the "women" in the relationship. I see and desire myself Pleasuring my BF/Husband by sucking his cock, kissing him, pay attention to his body, making love and being fucked by him! It’s something I’ve never thought about but now it’s all I want…I’m confused at to what to feel and If anyone would be willing to chat and help me I’d greatly appreciate it <3