“To live a good life: we have the potential for it. If we learn to be indifferent to what makes no difference.” Marcus Aurelius 
Worrying about the small unimportant things or the things you can’t control will drain you of the mental strength you need to be your best. It can also lead to other toxic habits, like blaming yourself too much or micromanaging other people. Don’t focus your time, energy and attention on those things that do not matter.