HOCD Problematic Porn Use

I want to start off by saying if anyone finds something triggering in this I'm sorry. At age 18, I woke up one day and had intrusive thoughts of men kissing me when watching porn. I stopped jerking off and somehow got to the conclusion that I was gay. After many hours of watching gay porn without an erection I was questioning my conclusion. I started researching my symptoms and realised I probably had HOCD (now diagnosed with OCD). Whilst also looking into this I took a look back at my memories and realised how weird my porn use has become. I stumbled upon porn at age 9. The worrying in my opinion started when around age 13 I was sexually aroused by the thought of being a female , it gave me a strong sense of arousal and at the time I thought nothing of it. I fantasised relentlessly until I stopped most likely cause I got bored of it. During this HOCD time, I was relentlessly checking my reaction to gay porn and realised I had no attraction to males however whenever Id watch female pov porn its as if something in my brain clicked and it knew there was a female doing these acts. It was initially linked to blowjobs but since then this has faded a bit , now I'm under the assumption my brain thinks kissing a man and being penetrated means that a woman is present and so responds by getting me erect. And yet again due to my anxiety, I cant stop checking whether the arousal has stopped. I know if I give my self time I will no longer go through this but it just actively stays in my brain annoying me. I've also noticed Ive got a reaction to transsexual porn. Note: I haven't orgasmed to any strange porn regardless of my reaction Im Just not comfortable with masturbating to them. It feels like I'm losing who I was, my brain makes me feel like I want to kiss a man and have sex with him only as a woman. If i think I'm a man I don't get the same kick out of it or if I notice the man too much I don't get a kick. Its more the fantasy of being a woman. I dont know where to go from this, Ive been trying to reboot for a year now longest streak 3 months(lost my arousal to female pov blowjob thoughts in this). I can only hope that I can stop my porn use I feel like it's genuinely the problem to everything right now; Ive been seeing posts like mine on lgbt forums and they all seem very positive but I'm sure this is not a positive thing to be thinking about. I believe my porn use is on a brink of a major escalation and I'd like to stop it before getting that far. Please someone give me help on how I can stop this.