At the end of the day, you are in control of your own happiness. Life is going to happen whether you overthink it, overstress it or not. Just experience life and be happy along the way. You can't control everything in your life, but you can control your happiness.
I like these words -- they seem to suggest action: If you hear a kind word spoken Of some worthy soul you know, It may fill his heart with sunshine If you'd only tell him so. If a deed, however humble, helps you On your way to go, Seek the one whose hand has helped you. Seek him out and tell him so. If your heart is touched and tender Towards sinner log and low, It might help him to do better If you could only tell him so.