Ever since I was maybe 9, I had this fear that I was hallucinating.
Like, I'd go into the bathroom and think that someone was on the toilet but I just couldn't see them.
Or in gym class, I'd think I was hallucinating my gym shorts and that by taking them off to change I was actually taking off my boxers.
Completely illogical, I'd realize the entire time "if someone was in the bathroom I'd hear them ask what the fuck I'm doing" or "if I'm hallucinating my shorts that means I did PE in my boxers and no one said anything" but I just couldn't stop worrying about it. The bathroom thing still happens from time to time
I also had a huge problem with worrying about "cameras" everywhere until I was 17