I've thought this but I've realized when I'm really tired I take real world things and fall asleep and dream about them differently but when I wake up I forget it's a dream and just think it's a memory so maybe your "memories" are just vivid dreams??

Yes! I listened to my abuser admit to my mom his SA to me but for some reason my mom has 0 recollection of that 😡

Yes, the other day I brought something up to my adoptive mother and asked if she remembered it because the incident had been on my mind lately, and she said that it never happened and that she was confused and concerned as to how I could "just convince" myself that it did happen, my adoptive dad had no idea what I was talking about either but I remember it so vividly that it has to be an actual memory.

YES OMG SO I VIVIDLY REMBER MY SOCAIL WORKER CUSD ME OUT ABOUT GAS ABD SHE SWEARS SHE DIDNT DO IT what a bitch

it could be that some of your memories are either false and created by your brain in an attempt to fill in the gaps to explain your feelings, OR they could be super vivid dreams/dreams that happen in the wrong phase of sleep that makes them seem real (an extreme form of hypnagogic hallucinations, something everyone experiences to some degree). do you have any sleep disorders or a history of head trauma? either way, a therapist is in order, they can help you sort through the feelings that may have created those memories and they can help you cope with your brain (or the people around you) betraying you