It's not reasonable to assume that everyone has that much control in any situation. Removing yourself from a situation is not always possible. What can you do if it's caused by your environment, like family, school, etc.?

Life does have challenges & there always exists someone who can be miserable in a given situation. That doesn't mean that everything should be normal.

You can definitely affect some things & you might be able to choose how you see some other things. Still, some things are outside your control or "as they should be".