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.
One scientific piece of evidence that supports this, is the placebo effect. Countless studies have been conducted, and confirmed, that the brain is exceptionally powerful -- not only healing itself, but far, far more.
If life isn't going the way you want, focus on changing your mindset. You have the power to have the life you want.
"We're not given a good or bad life. We're given a life and it's up to us to make it good or bad." -- unknown.