HOCD and Porn

Good evening you guys. I am currently experiencing a tough time mentally because I believe that i have HOCD stemming from me watching a lot of porn a while back, and this leads me to feel alone, depressed, and hopeless at times. I've always identified as straight my entire life and never had issues with my sexual identity till my senior year of high school. I started watching trans/gay pornography and saw nothing wrong with it for a while. One day I began having serious doubts about my sexuality CONSTANTLY and this threw me into a spiral mentally. I tried accepting that maybe I was experiencing bisexuality, told myself that this was a part of life and that I was overthinking it, but none of that worked. I would masturbate every night so I feel as though the drop in testosterone didn't help my mood at all. I am currently trying to reduce how much i do pleasure myself, and i've managed to get down to 1-2 times a week. I notice that I feel significantly worse the next day. I just want advice/guidance as to how to approach this. I want to stop thinking about my sexual identity all the time and not have to deal with the frustration and pain of not knowing. I already overthink everything on my own and I do not want to fall into a deep depression. Thoughts of any kind of self harm scare the hell out of me and I never want to have those. Thank you.