why are you so paranoid?

Sometimes i feel like everyone knows something about me that i don't.
it bothers me that people are laughing (i do know how it sounds- crazy ), i actually think the subject is me.Every month i' m taking a test and the results are always the same: you are paranoid.
  Since yesterday i'm not sure of anything, it's like i have a new pair of eyes.it's like just yesterday it was 2006 and now... what have i done!!!