Answer:
You should not suppress your emotions. It's bad for you to keep it bottled up inside for too long. But, if you must, hold your emotions in by thinking of something and going numb. Picture yourself as an ice block, and do not think about anything. If you must think about something, then make it a very simple subject or object. Analyze it in your mind until you can go somewhere safe and let all your emotions out. Or, you could think of something so complex, like the meaning of life, where the universe came from, and all that confusing stuff. Make sure you find a way to let them out safely, though.
OK so if you want to suppress you emotions you can and you will if you really are that desperate to but i suggest you don't. Long periods of time of suppressing your emotion could be harmful to you and to others. But if you are bent on doing this thing, and there are no other options to solving your problem then here is how you suppress your emotions. First you start off by thinking about something hurtful that has happened to you then remember it. like a really bad break up or a relative that was close to you that died sick i know but it works anyways when you can talk to someone about them that is crying because something bad has happened to them or they remember a precious moment and not give a shit. you've learned either to control yourself or to bottle your emotions for later to come out