I need help…

I have had the same false memory/instrusive image of me doing something horrible to someone when I was 12 and they were younger. It is a memory based on a real event. I truly don’t know if it’s real or not but obviously, the more I think about it the more I think it’s true. This has led my mind to become slightly paranoid. I worry that if this horrible image in my head is true then one day the person I might have hurt will come and k*ll me. I’m really scared I feel like I won’t feel better as long as this “memory” is in my head. Does anyone have advice?

I have been getting reassurance from someone on here… I know this is not what we should be doing… but I have a fear that the bad guy is going to get me and that things I do will lead to that… I think I misread what he/she was saying but I’m too triggered to look back and see, but I thought the message said “I talked to the bad guy” and I am freaking out on my bathroom floor… I thought about it and what that looked like and now I feel like I cleave into the bad guy…. Someone please help

*tmi warning* I'm so worried im a P. Ive been crying daily unable to do anything else but ruminate over my real events. When i was 14 (before ocd) i was watching adult content and it was censored. The woman had similar features like hair and skin color as my niece. I remember noticing that and saying "huh i guess I'll imagine that as the adult version of my niece" and I did and after i was finished i moved on and didnt think anything was wrong. I dont know if i ever thought about that again? Its so blurry ocd keeps saying i did it again in a different time but i dont remember its too blurry and its scaring me so badly! I didnt even remember this till like literally last week and i wanted to die! Im 20 for context. When I remembered i immediately broke down in tears. I vaguely rmemeber this other thought i had of her when self pleasuring when I was 16??? I think it was a testing thought out of distress? But im not sure at all! It was extremely vague image and unrealistic i dont think I liked it but maybe i did?! Im so distressed its like i remmeber 2 versions of this particular event which is why I think its ocd false memories from there. Ive been ruminating and spiraling for almost a week. I keep crying i havent ate well at all in days ive been honestly dehydrating myself and i cannot sleep. I feel like a monster. I did the mistake of researching last night and kept comparing myself to the "criteria" of those sickos and like I felt so distressed. I also have been asking ai for hours on end everyday. I feel so distressed im literally crying rn as i write this i cant calm down i feel like this sick individual even tho I dont even like thinking of that at all i dont think I meant ill intent when i was a teen but its killing me inside. I would NEVER harm anyone nor want to or plan to, deep down i know I would never act out in those evil ways but like whats killing me is what if im attracted?! Is this a sign?! Am i one of those people?! Am i attracted to my niece bc of those 2 maybe even 3(??)thoughts years ago?! Did i mean ill intent?! Am I an actual danger?! Am I a monster??? I have so many urges to confess to my mom im so scared what this all means or could mean. I feel so alone and scared. Like legit whenever i get intrusive thoughts about gross stuff i feel disgusted and anxious and push it away. Those thoughts do not bring me pleasure whatsoever but this real event is making me doubt my own identity 😔