How do I know if it’s a false memory or a repressed memory

Does anyone have advice on distinguishing between real event ocd and false memory ocd? If my current obsession is whether this intrusive image in my head is a real memory even though there’s no evidence it is, does that seem more like real event ocd or false memory? I feel like I’m getting into a trap of worrying that I’m obsessing over a real event instead of a false image and keep having thoughts that say “you know you did this” even though I really don’t think I did.

Without trying to seek reassurance, I’m wondering if anyone has insight on identifying an intrusive thought vs reality. Something that’s always really helped ground me in moments of false memory ocd is clearly remembering the exact moment the thought arose and how it started as “what if I cheated and don’t remember.” Then the images come and are extremely distressing, but I’ve always found some comfort in coming back to that moment of “this started as what if.” It feels like my brain is almost getting more creative with the thoughts now, and I’ve been having probably the worst anxiety of my life the past couple months after another intrusive thought entered my mind. I woke up after a night drinking and thought to myself “did you kiss your friend and don’t remember?” (Didn’t happen, undeniably proved). The rest of the day I stayed anxious about other things I could have done and poured over all my memories of the night. Then the next day I finally had found some peace based on all the evidence from my friends who were with me that nothing bad happened. I then thought “what about when you went to the bathroom,” which I hadn’t really been thinking about before, and then my mind immediately started flashing with images of me performing sex acts in the bathroom with some person who has no name, face, details, or anything I remember about interacting with them. I think I’m just concerned that this was a moment of genuine memory recall since I hadn’t been thinking about the bathroom before, and it was more of a sudden flash of images and “did you do that” vs “what if you did that.” I’m wondering how others are able to identify that something is an intrusive thought vs reality.

Can it feel like you literally remember a false memory happening? And it feels like the memory has always been there and you vividly remember it happening that way? Because I don’t even know if I’m experiencing a false memory or not but god it feels so fucking real. Like I literally remember it happening. But what’s weird is the original memory was kind of different. 2 years later, the memory is not the same, but it feels like I literally remember it happening. And in this memory, I’m fucking snapping. I’m acting on my thoughts. I feel like a fucking psycho. I hope this is just OCD