I feel like that a lot. I don't have DID or anything like that, but my memory for experiences and conversations is absolutely abysmal, far, far worse than anybody else's I know. Any question of "Hey, do you remember-" I can usually just cut them off and say 'no'. It's completely frustrating and I don't know why I'm like this.

edit: though I don't cut them off because that would be obnoxious.