21f - 
here are some of the things that I do/think that are nonsensical in nature and things i know are nonsensical but I somehow still do/think. 

I've always imagined entities watching me (my dead relatives/ancestors) or them being able to hear my inner thoughts 
I don't feel alone with myself sometimes I'm always feeling like I'm being judged or analyzed from an outside source whether it be from friends talking shit about me or from entities watching my every action 
I feel like I have no privacy with what I internally think because I was told from a young age that God knew everything I thought and I think it snowballed into dead people being able to hear my thoughts too. 

I have to sleep with my ear covered at night because I will only imagine bugs crawling in or people whispering into it I cannot sleep if my ear is not covered. 
I also don't like sleeping with my feet outside of my covers or I imagine entities grabbing me and pulling me out of my bed, or people putting needles in the middle of my feet. 

when I walk into certain rooms like basements or garages sometimes I imagine dark figures or things that could hurt me in nature standing in strange places watching me.. I know they aren't there but I've spooked myself a couple times. 
when I'm walking outside in the dark I imagine dark figures watching me and moving closer to me, and dangerous animals stalking me. 
when I was a child j would imagine horrible terrifying demons? ghosts? I don't know... crawling up ceilings and coming towards me - the only way I could get past the thought is if I stared directly at the place i imagined it to be and show myself that it was only in my head. if I didn't I would just get extremely scared. 

sometimes I will wake up with intense feelings of doom and I will get intrusive thoughts of horrible things happening to me during the day - like car crashes, being killed things like that it makes me not want to get out of bed. it will be pretty vivid in my mind too 

I went through a period where I had to repetitively check the stove knobs and the garage door - I would look at the stove and see that it wasn't on and tell myself "the stove isn't on" and then go to bed, wake up in a panic later on because I had convinced myself that one of my family members turned the stove on or that the way I turned the stove off didn't work and that the entire kitchen was filling up with gas.. I've driven 30 minutes home from school because I convinced myself the garage door was wide open and the house was getting ransacked even AFTER shutting the garage door and knowing that I shut it and telling myself I shut it. 

also my thought process sometimes revolves around constant "bets" with random scenarios 
I constantly do it some examples are: 
"if the door shuts before that man reaches the staircase my answer is no" 
"if the light turns red before I get to it then my answer is a yes" 
it's like I'm always asking the universe yes and no questions like an eight ball. 

a couple times while I was feeling really depressed and stuck in bed I would imagine my life being better than it was, living out past scenarios and changing the outcomes, having conversations with people I had never talked to and creating elaborate scenarios in my head. 

I realize that a couple of these sound strange in nature... but some I feel like other people experience too so I don't know if they really are or if they are just an overactive imagination