Can you once enjoy something and then it become a fear and a intrusive thought...

I wanted to ask if it is possible to purposely think of an intrusive thought and then shifting your mind instantly to something else? Is it still an intrusive thought if you have been thinking of it 'purposely' for a second? I dont know how else to explain it, but it felt like I was purposely thinking of it. Anyone else had similar experience what happened during intimate moments like masturbation I feel so ashamed cuz the thoughts are so bad they're either about family members children and stuff like that it feels like I think it I just want to know if I'm not alone I feel like a monster because it feels like I thought these things or like I did think these things and I don't know what to do I feel so ashamed and grossed I need help I just want to know if anyone had a similar experience to shed light on because I don't know I feel so isolated

Hi everyone, I'm struggling with what I think are intrusive thoughts, possibly related to OCD, and I'm hoping someone here might relate. When I was younger, in my early teens, I went through a period where I had a strong interest in pornography. During that time, I encountered hentai involving male characters, related to an anime I enjoyed. One of the characters was someone I even looked up to. I feel incredibly uncomfortable admitting this, but I believe I engaged in sexual activity related to it. Years later, I'm plagued by intrusive thoughts about this. I feel intense self-disgust and shame. It's like this memory has "tainted" my ability to enjoy that anime, and sometimes other things. I'm constantly replaying the situation in my mind, questioning my past actions, and worrying about what it means about me. The anxiety is significantly impacting my life. Does anyone else experience intrusive thoughts focused on past events, particularly those that cause feelings of shame or disgust? How do you cope with the constant replaying and questioning? I'm looking for support and understanding. Thank you for listening.

Whenever anyone starts to feel like their thoughts are less triggering or they feel a moment of happiness/ relief OCD tells you that you want the thoughts back or you actually like having the thoughts and maybe thats just the person I really am? I feel like im going insane😢