I feel like I would remember if I did something bad or not. It’s driving me crazy! I just want to remember the truth!

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 asked my brother if I did something and he said no I don’t believe him I think he’s lying last night my mind was trying to convince me to do something to him like what if I did something in my sleep or we did something and I don’t remember it because I don’t remember anything my brother asked me this morning where is his iPad and I don’t remember him asking me that so that’s where I’m worried what if it’s the same I feel a sensation down there so I’m convinced I did something really bad

can a false memory feel very very very real? because i literally don’t know if something happened or not. absolutely no clue but it feels so real