Managing My Anger

My Anger Issue

I don't know if any of you experience this but sometimes I feel really really angry. Maybe it's because I don't meditate regularly or some nights go to bed too late, but I find that I'm always easily angered and frustrated especially when playing sports.
When I make mistakes myself or in a team game the other team gets jammy and I feel their achievements aren't deserved, I tend to throw equipment or take it out verbally on my teammates or opposition.

Overcoming the Rage

I understand that when I present this frustration it gives me a bad reputation and I am not being the best I can be.
Can anyone here help me in the form of advice, tips, etc?
What things do you do to stay calm during sports?
Good websites direction if you have any.

Thanks