Is this normal paranoia?

I keep feeling like I can't really trust anyone, I walk up town and feel constantly on edge, I keep having dreams where there is people under my bed, or behind my door every time I forget to check. When I go for a walk, of which I used to love doing, going out and taking pictures every time I see someone I keep feeling like they're going to hurt me, like I check their hand for knifes & stuff. I have to watch them until they leave my sight fully in order to carry on walking I don't enjoy it anymore, because I feel like I have to constantly be super alert. I keep seeing people who aren't their too, like chasing me. If I go for a run the other month someone was running next to me & came out of the hedge to get me & I ran out infront of a car before realising they weren't real & when I went for a walk up near a hill near my house I saw two people hiding and they both came running towards me.. it's so scary. I hate this. It's like I'm in a horror movie all the time & I can constantly feel my heart racing in my chest.