Although the concept of self-fulfilling prophecies was originally developed to be applied to social inequality and discrimination, it has since been applied in many other contexts, including interpersonal communication. This research has found that some people are chronically insecure, meaning they are very concerned about being accepted by others but constantly feel that other people will dislike them.
I tend to feel very insecure when I am meeting new people because I am afraid they won't like me. But once I open up and talk to them, I never have a problem. This is a good idea of what to do, and to just manifest positive thoughts. When you allow those negative insecure thoughts to stay, they can keep you from having the opportunity for positive thoughts.