Limiting beliefs have a small truth in them. It's just that the belief holder's mind has taken it too far. Most people explain limiting beliefs as originating in prior negative experiences someone received growing up. When it comes to socializing in particular, some limiting beliefs are mainly based around anxiety. They're an excuse the person has unconsciously made for himself, so they don't have to face a situation that makes them uncomfortable. Some limiting beliefs are really hard to get rid of. They feel very real. Another good sign someone has one is that no matter how much everyone else tries to convince them that their ideas are not true, they never seem to change their mind. Not only can people with limiting beliefs seem blind to the issue, they can even come across as annoyed when others try to explain what they think is really going on. It is some kind of inferiority.