I never feel that I am good enough to be a part of society. And the only way that I feel important in my live is by playing sports. But then I can not control my anger.

Honey, what got you to feel this way? I think you should work on yourself esteem a little more and then work on your anger issues. I have no idea how old you are, but if you are younger, you CAN grow out of these feelings. Just try to always think before you act. You ARE worthy of society and you ARE valuable. You should never feel as though you're not. Everything will work itself out and you will achieve better things in life. <3