P.S. When You live Your home and You lock the door, is it called paranoia too ?

No, but refusing to go to sleep because you think there are monsters under the bed
is paranoia. And demanding that no one
else be allowed to sleep because of your imaginary monsters is a nonstarter.
(Actually, where I live, locking the door
would be a sign of paranoia. My town has no police force, because it doesn't need one. The crime rate is virtually zero. I have neighbors who don't know where their house keys are, because they've never locked the house!)