How to be mentally strong:

. Don't fear alone time.
. Don't dwell on the past.
. Don't feel the world owes you.
. Don't expect immediate results.
. Don't fear taking calculated risks.
. Don't give up after the first failure.
. Don't shy away from responsibilities.
. Don't worry about pleasing everyone.
. Don't resent on other people's success.
. Don't let others influence your emotions
. Don't waste time feeling sorry for yourself.
. Don't waste energy on things you can't control.