Don't worry about what you can't control. Our focus and energy needs to be on the things we CAN control. Attitude, effort, focus- these are the things we can control.
Something I learned early in college (is) to not worry about what I can't controlBut what I can control is my attitude, my effort, my focus every single day and that's what I'm trying to worry about.
I'm blessed, because of my faith, that I don't have to worry about the future because I know who holds my future.
Don't worry about what you can't control.