I’m not good with masking my emotions sometimes, although I do try to process the things before I take any action.
My face and body language on the other hand can reflect what I’m going through at the moment.
Are you aware of any ways to control yourself under difficult situations (apart from things like meditation) ?
I know you already mentioned it, but meditation and thought-stopping techniques are genuinely good practice for making you less reactive to immediate emotions when it’s inconvenient.
Otherwise? Maybe introspection to figure out where the anger is coming from and then challenging it. Often, anger is paired with a desire to control something (a person/situation), so challenging the expectation for something to happen the way you want it to happen could be a good start.