Is this a mental problem? (being OVER forgetful, and i had a conversation that "didn't happen")?

Are any other of you relatives forgetful, for one thing? Because my mom is forgetful, and that's a thing I get from her. For another, were you tired? Because the human brain is capable of some weird things. Like at night when i was little, I could sit in my room and think and hear a conversation with a supervisor at my school, and i could hear her voice perfectly, and no, i was not dreaming, i was awake, so it was not that.