I have to have my lights on all the time, and check my closet before i take a shower. (i have a WIC in my bathroom)

also i have to sleep with my lights on and can barely be alone, without thinking some Adamm Lanza/John wayne gacey, esque maniac is about to kill me.

I have had this fear since i was in the second grade, and I just want to know if anyone else feels like this, and how they dealt with it?