How to keep your cool in an unwinnable Ranked game?

Sometimes you can feel it right from the start. This game isn't going to work. It's minute 7 and everyone is behind in farm. Toplane already died twice. Botlane once. Another player has connection issues and keeps trying to enter the game without success. People flame and chat more than they play. Tell me what to do in a situation like this. I know I will try to surrender at 15 and I also know people never surrender so it's hopeless. I can get so frustrated and don't know how to handle games like these. Mute all works a bit but doesn't chance the fact that toplane goes 0/6 in the first 15 minutes. As the game continues, enemy gets more and more kills and the game just feels like being held hostage.
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