Each of us has an inner critic. There is no way to grow up in our society without having developed this inner critical voice - which comes from parents, teachers, peers, the media, and from our own conclusions.
The problem is that this inner critic sounds like a voice of authority, when in reality it doesn't know what it is talking about. It is a voice based on beliefs that have been handed down through generations but that have no basis in fact.
https://www.innerbonding.com/show-article/4908/beyond-the-authority-of-the-critical-voice.html