First, external performance, although external value is not equal to self-value, but because of the social society in which we live, the quality of external performance will affect our self-judgment. If we insist on external realization, our hearts will gradually identify with this self, such as making money, being responsible and having the ability, and we will work hard in one direction.
Second: inner appeal, that is, what kind of person do you want to be? Whenever you have nothing outside, do you still love yourself and believe that you can start over? This is the real you inside. If you can build up your inner self, you will be confident.
Third: psychological problems. You said that when you see acquaintances, you will dodge and don't want to meet acquaintances and say hello to others ... These may be caused by your childhood experience, or you may have been hurt at that time. When you are a child, you need to accept, cure and solve this psychological problem, and you will start over and look forward to the future.
In fact, the most important thing to overcome inferiority is to deeply believe in yourself. Get up every day and hint in front of the mirror that you can do it yourself!