Get older.
Weird.
It sounds like a BS answer, but it’s true. My personal experience is that the older I’ve gotten, the less I’m affected by the world around me. My best guess is the experience of time can lend coping mechanisms, under the proper circumstances I’m sure.
It’s just not actionable. It’s not something you can do.
It is something you will do though. So you can rest easy on that part. Sometimes the best course of action is to do nothing.
It’s less about the intensity of your emotions and more about how you deal with them.
Let’s say you got really angry in public. It’s fine to get angry, sometimes there are good reasons for that. But there are multiple ways to deal with that anger. An unhealthy way would be to run amok and harm innocent people in order to vent. A healthy way would be to calm down, reflect on what makes you angry, and then either make an effort to improve your situation or remove yourself from it.
You can’t help feeling a certain way, but you can choose how you react to your emotions. Try to pick the option that is the least destructive to yourself and those around you. If emotional regulation is hard for you, you can learn coping skills from a therapist.
Read up on stoicism
Do you have any good recommendations to start from?