Why cant i get rid of this,am i bi?

Im a male 17 yr old. Ages months ago I developed an ocd about being gay/bi. It wirsens depending on how im feeling classic ocd. If im depressed about it, its bad. It started with worrying about getting aroused over muscular guys. When i don't worry and am positive its at its least but when depressed at its worst. I feel like i get aroused over it sometimes, with ocd im driven in a cycle of fear. I reckon ive had ocd for about 3 years, just different topics. Its more a fantasy I think my head is filled with gay fabtasies about muscular men. I recall last year a bit, but I didn't desire in real life to hook up with a muscular guy, only girls, i dont want to penetrate a muscular man. But when im at the gym, positive i see ripped dudes and dont get aroused. Im really confused. I kept thinking id get aroused by rubbing a mans chest, it was a paranoid fantasy. So i rubbed my own chest several times with oil in the mirror. I didn't really obtain arousal from it. I got a very slight semi because rubbing with oil, has a sexual nature but i now know I wouldn't get aroused doing it to another man and defo not with ocd gone away. The ocd has gotten worse but i try not to think of it. Am i bi? Or is it ocd, fantasies, hormones and confusion? Please help this really deoresses me, I didn't have this bs before I started excessively obsessing so don't start with this denial bs