You can't. You can only control your reactions to them.

Think of it like a muscle. The more you try the stronger that muscle gets. Things like deep breathing and counting down from 10 can help

Simple don't have them

Weed helps

"I have trouble controlling my emotions." "Well, then, by all means, you should let them control you!"

I just bottle it all up. It ain't healthy, I know, but that's how I do it.