3. Remember the 90-10 rule.

This is a formula, a ratio, for how you should calculate how you value yourself, based on 90 percent self-worth, 10 percent assigned worth. Ninety percent should come from your self-acceptance and self-appreciation, and just 10 percent from that occasional sliver of external validation we all need.

Overthinkers distort the formula, even reversing it by acting like 90 percent of their worth comes from what others think or say. So they worry, which takes the form of--you guessed it--overthinking.