Why cant i hold my anger anymore?

For quite sometime now i have felt so angry and just people making little smart **** comments makes me want to go over and hit them. I am now 17 so i cant be getting into fights anymore but i just cant help it. i lost my first game of soccer yesterday and one of their players said "hey you guys were undefeated right?" and i snapped and got carded i feel so bad because the only thing i care about is my soccer team PLEASE help.