Is it normal to have paranoia?

Since i was 6 i am afraid in the dark, i thought that there were monsters chasing me wherever i go. I thought it would get better in time but it only got worse. When i just walk on the street, at school, even in my own house and in my room, i think that there are cameras and microphones everywhere. Sometimes i even think that theres something in my head that can read what i think. I went to a psychologist, but she said i was just fine. Am i?