In her book "13 Things Mentally Strong People Don't Do," Amy Morin writes that developing mental strength is a "three-pronged approach." It's about controlling your thoughts, behaviors, and emotions.
1. They don't waste time feeling sorry for themselves.
2. They don't shy away from change.
3. They don't focus on things they can't control.
4. They don't worry about pleasing everyone.
5. They don't fear taking calculated risks.
6. They don't dwell on the past.
7. They don't make the same mistakes over and over.
8. They don't resent other people's success.
9. They don't give up after the first failure.
10. They don't feel the world owes them anything.
Source: Traveleisure.com