We often make up stories about ourselves in our minds. Not all of them are true. But the mind does not know.
That’s why if you repeat a story too often your mind will act and react as if it was true.
Works for both good and bad stories. So be mindful of stories you tell yourself.
Another thing related to this is that everyone makes up stories about others in their minds. Most of these are not true.
And more importantly, those stories can’t affect you the stories of your own mind can. So don’t worry about what other people think about you.
Unless you are in a profession when the value of perception is big or stakes are high like for a politician. Then learn to manage perception.