My first major delusion happened when I was in college. I was not diagnosed until my 30s, over 10 years later.
My delusion was that I thought my college boyfriend who had graduated and lived 2 hours away was cheating on my with his ex who still attended school. I didn’t know her but I had seen pictures. I found out that her dorm’s front door faced my window and I knew that I would know if they had been together if I could just get a glimpse of her. I would be able to read her energy or aura and know that they had been together.
I spent hours watching for her. I skipped classes and only went to public places like the campus center to wait for a glimpse of her.
I don’t remember how long it lasted or how it ended, but I remember feeling desperate to get just one look at her so I would know.

I have had other delusions about people wanting to hurt me in some way and delusions of grandeur about becoming famous by opening businesses and having them take off like wildfire.

I am in a weird space lately too. Not exactly delusional, but full of cognitive distortions that I am trying to challenge.