How to forget the wounds from pre school and high school bullying?

Everyone knows that bullying makes the person grow up without self esteem, self confidence and whatever. Even if the person is good looking. So how to get these negative thoughts about the self from the person's personality? These feelings kinda become part of the person's mind. It's attatched. So how to get it out?
How to forget the wounds from pre school and high school bullying?
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