How to not have emotions while playing games?

Title. I get really into whatever I do, be that gaming, or art, or a movie, or anything. But, that means I yell at League occasionally. Problem is, my dad is a fucking freak, and actually beats me any time I make a noise or have emotions.

I can't afford living by myself, and I have no friends, so I can't stay with anyone. I can't stay with my family since my dad controls them all with his asshole-ness. So my only option is to just not have emotions while gaming or doing anything.

So how can I play League and just silently sit there, no matter what bullshit is going on?