how do you not get angry at losing a game

IM NOT A FLAMER !!! I never talk in chat!, but maybe that's part of the problem I get angry whenever I play my best and yet I lose because Yasuo support (literally last game) or wherever loses me the game I just rage so hard at myself that I get a head fake for a week after that game... I'm talking about this type of rage I keep telling myself "it's just a game calm down..." and I rage even more Now that i think about it how did i MISS TAHT STUPID COMBO FUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU....
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