I feel paranoid only when I’m in a bad mood (usually at work or when tired), and feel I have a constant miserable facial expression.
When I’m in this state I feel that people are looking at me, and possibly talking about me. I’m usually aware of any laughing.
If I’m in a good mood, paranoia or any other negative thoughts never even cross my mind. I’m assuming its human nature, but I still don’t like it.