Why are my thoughts getting more gross and disturbing

Hey guys today I just wanted to come here and share an experience I have and I generally don't know what to do I feel like a terrible person for having these thoughts and for thinking them I genuinely don't know what to do I don't know the signs behind it and why I think the way I do but it's honestly driving me crazy I don't know what to do I have a pornography addiction for a long time it's where it's like anytime I'm an intimate moment or am masturbating my head just thinks these weird things always the same repetitive thoughts to of family members your younger sibling or a young child I myself am a 17 year old and I feel so disgusted I feel like I can't live my life anymore I feel like I'm a criminal cuz like it feels like I chose this these thoughts like I actively think them I don't know the signs behind it and I just really need professional help if there's any like therapist here that could fill me in that would be nice I would also like to know if you guys had any similar experiences because for me I feel like I have to rewatch pornography and do it right without the thoughts cuz I feel like the thoughts are just like to prevalent anytime I do anything related to masturbation why do I think this way I'm also just trying to be as honest as I can with this I'm not trying to make myself I guess a victim I'm trying to hold myself accountable if I actually am like this because I also have doubts in my head that tells me that I enjoy these things I feel like I'm going crazy someone help because it feels so real like I acted on them or that I was pleasuring myself to the thoughts and not towards the video it's just how can I live with myself you know also during it it felt like I was thinking the thought for a long period of time like it was dominating my head so I couldn't focus it felt l

I know I'm not attracted to children, there's no proof I am and no indication that I am. Yet why do I still get these sexual intrusive thoughts? Why do I still feel so uncomfortable? Why do I feel disgusting, distressed and confused when I get them? Why do I get them in the first place yet I still don't feel anxious enough? I'm really confused about this. I'm not going to do anything to a child or think of a child that way yet at the same time It gets all over in my mind. Is it just me like uncovering some attraction to children that was buried and where would it even come from I've always been attracted to men that are older than me (not like grandpas or something but 1-6 years older) so why the hell am I even getting these thoughts now? I'm genuinely so confused and I don't want this to happen. It feels I'm betraying everyone especially myself

Was listening to the diarrhea song cuz I remember hearing it as a kid, this one guys version ended with “when she’s sitting on your face and you get a bad taste.” Anywho I had a whole thing bc of that involving different people but the main one that’s bothering me is I thought of my sister and her bf. They’re pretty edgy and I guess in general edgy people are freaky. Anywho I had the urge to imagine them while he gives her oral. And I tried to ignore it but it seemed too real and so I gave in and imagined it. And shocked, I think I liked it. Whether it’s because it’s sexual in nature so it was a general thing, or a taboo thing and that’s why I liked it BECAUSE it was gross and I shouldn’t think about it. But anyhow people say ocd can’t make you do things but I believe it still in a way made me purposely think that. Any words of advice appreciated !!