Improving yourself is a lot more profitable than trying to improve others.
Stop worrying and start living.
When you face a problem, solve it then and there if you have the facts necessary to make a decision. Don't keep putting off decisions.
Criticisms are like homing pigeons. They always return home.
If you can't sleep, then get up and do something instead of lying there worrying. It's the worry that gets you, not the lack of sleep.
In fact, merely writing the facts on a piece of paper and stating our problem clearly goes a long way toward helping us to reach a sensible decision.