My sexuality is confusing

Hi so I have only ever liked boys before and I only had fantasies about them. I have only had sex with men but I have been having heavy intrusive thoughts (like ocd) saying what if I’m bi? like I think about the idea and I don’t really think I could do much with a girl I do however think I would be aroused sexually but I know that literally anything can get you aroused just because it’s a sexual content does not mean you’re bi so now idk. My thoughts have been killing me because my anxiety is too much right now, causing great distress because I fear becoming bi. I want to only be straight and I want to not experiment anything Because I’m scared it will show that I am bi after all and I don’t want to be. Not that there is anything wrong with being apart of LGBTQIA+ but personally I don’t what to. can anyone help me to know if you’re actually bi or is it just my ocd? Thank you! I hope I didn’t offend anyone