I want to yell at my friend over a game.
Do you think it is good to yell at your friend?
No, I should probably keep my emotions under control.
It's good that you recognize that you should keep your emotions under control, because yelling at your friend is rude. It could hurt your friendship with him.
This is probably true. I really do not feel that we are all that close anymore though, maybe yelling is ok for this reason.
Just because you aren't close with someone doesn't mean they won't be upset if you yell at them. There's really no excuse for yelling at your friend because of a game, so you shouldn't do it.