Neglected children become adults who think no one likes them.

The fear that people don't like you, that at any moment people will turn around and reject you, comes from real rejection that's happened in the past. The childhood wound of not feeling loved or liked enough gets projected onto our adult relationships.

When children are rejected they blame themselves, believing there's something wrong with them. So as adults we feel there's something inherently wrong with us and people will see that.

There is nothing wrong with you. There was never anything wrong with you. The only thing that is wrong is that you didn't get the consistent love you needed.