How can you tell if you are gay or not when you feel like there is proof in the past to show it! Can't stop ruminating :(

So hard to not engage the thoughts because even though it's from the "past" (i don't even know if im remembering things correctly and it kills me) and i can't change it, I just NEED to prove it to myself that it didn't happen this way. If you'd asked me questions maybe a few months ago, I would have been able to lucidly explain things. Now I just feel like I'm in a constant swarm of thoughts, not knowing if anything is real. If my brain is to be trusted. Wish I could just get hypnosis to forget

I’ve completely lost myself. I can’t focus on my studies, I can’t go to the gym. Dang it I can’t even be around my male friends normally anymore. I got no idea why or how this happened but the only thing I know for sure is that I never questioned my sexuality neither doubted it. I never cared in general. I just liked girls. I keep testing and keep testing and keep testing my arousal but no matter how many times I see but I don’t feel the same way for guys that I do with girls my mind will always try to make me believe that I am gay. It’s like it’s forcing me into an identity I never asked for. But at the end of the day like my psychologist told me. Sexuality doesn’t change. So since I never felt anything for guys in my life it’s ocd. I’ve been up and down for 5 months now and while the last week I was feeling way better. Monday now and I’m back to zero. I just want to go back when everything was normal. I can’t keep living with this.

I need too know that I'm not insane, really. I am 16 and for the past two weeks, this has been completely ruining my health and happiness. I only recently came out as a lesbian like 3 months ago after a lot of confusion about my attraction since I used to think I liked men. At first, I felt so sure that I liked women, but lately, I've been having these unwanted thoughts about the possibility of liking men. I never used to feel this way, but now, every time I look at a man, my brain obsessively fixates on it. It forces me to imagine kissing him, loving him, things I don’t want, and then tries to convince me that I do. It’s painful. The thought of this fills me with fear and anxiety, leading to panic attacks and breakdowns. I don’t want these thoughts. I hate them with every fiber of my being, but I’m terrified that one day I’ll act on them and somehow like it. I used to think I liked men, but back then, I was in a very unhealthy space in a time of escapism and something deeply parasocial. I’ve only ever liked the attention and validation a man could give me, but these experiences are somehow treated as further proof that I’m "bisexual." I’ve never been in a real relationship with anyone, which makes my brain constantly challenge me—telling me, “You don’t even know what love feels like.” It won’t shut up. It keeps obsessively trying to make me prove that I’m a lesbian, testing my reactions and questioning my certainty. Is this normal?