First - There's no such thing as an "important sports game."
Second - You will only have one or two real friends in your life.
Third - A month from now, nobody is going to give a rat's furry rear end about the exams you skunked.
Now it's time to get over it.
One of my favorite quotes is this:
"Sometimes things look bad and it looks like you're not gonna make it...if you lose your head and you give up, then you neither live nor win... and that's just the way it is."
- Josey Wales