i am 19(f) and for as long as i can remember i’ve been struggling with this . Randomly, something will pop into my mind, an example being i did not lock my door. however, i know that i did lock my door, i still can’t stop thinking abt how i didn’t lock my door, and i think abt it so much that i begin to falsely create memories of me not locking my door. it keeps me up and i have to check that i did it at least 2 times. in june, i got a car . every night i had to go outside and make sure my car didn’t roll away( even tho i would clearly know it rolled away, &amp; my car even beeps if it’s not in park&amp; i take the keys out) or that i didn’t leave a window down or a door open. every night. no matter how cold or hot it is, i had to check. i am now in college and my car is parked abt 10 min from my dorm; so it’s a walk to go look at it. almost every night, i walk 10 min back and forth TWICE to make sure i didn’t hit a car, leave my door open, window down etc. it feels very compulsive.  i ALWAYS know that i never left my door unlocked, never hit someone’s car etc, but i fixate and fixate and i begin to not know the truth anymore and it keeps me up at night until i go look.