The feeling of being watched

Hello guys so i want to talk about something i’ve been going through for years now,I feel like i’m being watched at all times , at my home at uni outside everywhere and i’m so scared of this, and also i’m scared to check my house when i feel like i’m being watched like what if someone actually was there?
also i sometimes see things moving at my home like furniture changing its place or so.

so is this a mental situation? or what is this cause i’m so paranoid and tired of this

if there’s any therapist here may u tell me what does this mean please?