Everyone has heard about the concept "if you believe you can, you will." Numerous occasions and examples can be made supporting the power of positive thinking and of the the mind, in general. I would like to take a moment to remind you of this power. It's real and it works. While most people belief this is just hokum, you are merely telling yourself it doesn't work. And guess what? It doesn't.
If life isn't going the way you want, focus on changing your mindset. Nothing will change if your mindset doesn't.