We suffer more often in imagination than in reality.

- Seneca

If the above is something that happens to you, apply dichotomy of control.

This is a stoic principle that breaks down to:

If something is outside your control, don't waste energy on it. Channel your energy into things in your life that can be changed. In this way, your life will always have small but meaningful improvements.

These small improvements lead to a better life over time.

This takes work and emotional discipline. Over time you will be better than you are now.