"Fake it until you become it"

The things I feel most confident about is the personality that I have and the confidence I have now in myself on accomplish things that I would never see myself do. I was always mortified to try new things. Until I decided to boost up my confidence so now I'm not to vulnerable to try new things. Although the thing I need to boost up my confidence is to stop thinking about everything in a negative way or a negative outcome. I have trouble trying to think about things in a positive way. I think I could fix this by trying to not overthink things because I tend to do that a lot. Also try to think things in a positive way till I become it.