Is it normal to feel like people/things are watching me?

Most of the time I just feel like everyone is watching me and trying to find out everything I'm doing.

Occasionally I feel like certain people or things are staring at me in a menacing/creepy way. Example: I'm on the computer and someone is sleeping on the couch near me, it appears like their head is turned in my direction out of the corner of my eye and it feels like they are staring at me about to do something to me but when I look they aren't. Sometimes I think their eyes are slightly open and they're staring at me. It's happened with my dog and stuffed animals too.

Other times I think that someone or something is hiding somewhere and watching me. Example: I pulled out the lint trap which is in the back of the dryer leaving an open vent. I immediately felt like someone was watching me through it. I was afraid to put it back because I thought someone was looking at me through it. When I get worked up I start to think I see people or I feel like something is in the room with me hiding somewhere/invisible or outside watching me.

If I wake up by myself when it isn't fully light outside I've noticed that I feel a presence in the room and panic. It feels like something is in the room with me but I can't see it and I can feel when it tries to come towards me.