To live a happy life, forget:

1. Past regrets and mistakes

2. Unresolved grudges and resentment

3. Negative self-talk and criticism

4. Unrealistic expectations

5. Past hurts and traumas

6. Fear of the future

7. Insignificant minor annoyances

8. Self-doubt and insecurity

9. Negative external influences

10. Unnecessary worry and overthinking

By letting go of these, you can find peace and contentment.