My general rule for feeling mentally well is understanding that the more I judge others negatively, the more I anticipate negative judgement from others. Practicing kindness and leniency and forgiveness has no guarantee of reciprocation, but it puts you in a better state of mind.
You are your own worst enemy.
You waste precious time dreaming of the future instead of engaging in the present.
Since nothing seems urgent to you, you are only half involved in what you do.
The only way to change is through action and outside pressure.