Is this normal? if not what is it.

Open doors, open windows, open curtains, open doors (no matter where in the house) being alone in my house, all of these things scare the life out of me. If I'm home alone I will immediately close and lock all the windows, close all the curtains, lock and lock all the doors, etc. I'm scared to open my curtain because I feel like somebody could be watching me, even though nobody probably is. If I'm in a room and the door is open I don't feel safe and I then get extremely stressed out and need to close it again. It also creeps me out when the other doors in my house are open, so I close all the doors. If one of the doors ends up being open it is kind of a test to see if somebody is in there, even though it could just be one of my cats opening the door. Also I keep my ac on or some sort of white noise on all the time when I'm at home so I don't hear creaks and sounds in the house (mostly caused by my cats) which creep me out a lot. Due to this I stay in my room a lot.