What Does Siking Yourself out Mean?

To psychologically manipulate or intimidate someone or oneself with the result of undermining performance or confidence. The boxer is notorious for the obnoxious and belittling taunts he uses to psych out his opponents. I got so nervous before starting the driving test that I think I just psyched myself out.

What does it mean when you psych yourself out?

to try to make yourself feel confident and ready to do something difficult: I have to spend a little time on my own before I give a speech, psyching myself up. SMART Vocabulary: related words and phrases. Encouraging and urging on.

How do I stop psyching myself?