I've been told that I "bottle things up and then explode". How do you not "explode"?

First, don't tell me that the answer is just to "not bottle things up", because that's objectively incorrect too. Society doesn't want you to have any negative emotions. I need to know how to not express negative emotions at all whatsoever unless I'm alone. I know it can be done because it is done in many other people on the planet.

Edit: Ok so I think one of the things I want to try doing next is ask for a med change from my psych provider.