What are people talking about me? Why are they staring at me? Is someone watching me? These kinds of questions might seem normal to some people in their minds...
Tag - paranoia
Paranoia is a state of thinking and feeling as if you are threatened by someone though there is no such evidence. These thoughts are often known as delusions. For example, someone made a nasty comment on you once, then you think they are going to hate you forever no matter what you do.