How can I overcome porn addiction? I have soocd and I'm addicted to lesbian porn

I'm 17 years old I struggle with addiction I have a problem when I masterbate I have intrusive thoughts idk if I think them I'm so scared also back then I know when I was younger I looked at obscure things hentai all that my idk what to do even I feel like I'm a monster or im a bad person I need help I feel so distraught I feel like I can't live life to the fullest anymore even from last year I looked at content that was animated but it had a character in it that was underage I felt so ashamed and felt like a monster I had a compulsion to check it only to find out they are not around my age range idk what to do I probably sound like a freak I'm sorry I'm always trying to replay my memory and try to remember my intention and what I was doing how I come across how I was doing a action yk all that

I am a girl's in my twenties. I got diagnosed with OCD last year. I have a boyfriend, sadly we're long distance right now. I've liked boys all my life. It's very difficult to sustain intimacy in a long distance relationship. Sometimes I have intimate calls with my boyfriend and it's nice. Other times, however, (and I am not proud of it) I do watch porn. I started watching porn when I was 16. I've tried to quit it many times but every couple of weeks I go back to it. And as everyone knows, one of the MANY problems with it is that your brain will always ask for more. More taboo things, more explicit things. I have a daddy kink. I've roleplayed with my boyfriend and watched porn of this kink. Now, the thing is that my brain keeps telling me that I won't orgasm unless I think of little girls being ab*sed. I've never looked for that on the internet, I never want to either. I am under EXTREME DISTRESS, because what my brain tells me feels SO REAL, and it's like my pleasure gets blocked and that contributes to me thinking my brain must be right. It wasn't like this before. I want to go back. I'm scared it will be like this forever now.

When I was single, I watched a lot of porn, specifically lesbian porn even though I’m straight. When I got into my current relationship I dwindled down and eventually stopped watching porn of any kind, around six or so months ago. I had a flare up recently that has caused me to question every part of myself including my sexuality and my identity, my relationship, and other things that are important and valued to me, and porn keeps popping up in all of these things. I feel like my porn usage was me cheating on my boyfriend, especially in the early parts of our relationship. I broke down to him last month about it and he said it was okay, that he forgives me, but I’m still hung up on it because I can’t shake the feeling that I’ve wronged him and that I’m a terrible person and that I need to leave him because of this. This is so excruciatingly painful. I don’t want to keep confessing over and over and over again, but I don’t want to be a dirty lying cheater, which I feel like I am.