Control what you can control. Don't lose sleep worrying about things that you don't have control over because, at the end of the day, you still won't have any control over them.
I saw soda pop for $1. 20 a six pack. That price messes with your head. You start thinking you're gonna sell soda pop. Suddenly I've got packs of pop with me. "Looking to buy some pop? 50 cents a can. It's not refrigerated because this is a half-assed commitment!"