I have a huge anger problem?

Okay im 15 and since I was little people always said I was gifted in brains wise i got to many opportunities to skips grades but I made my grade lower because i wanted to stick with my friends,But anyway I cant stand being wrong or losing,I cannot watch 1 minute jeopardy because im not smarter then them!If I lose at a game it can climax to a fist fight,And also to alot of people Im the funniest they've ever met but if someone else comes along trying to make people laugh all the time I wont let him win.And when i'm not complimented when someone else is i get HUGE jealousy Everything ticks me off at times Like when I hear the word "aggy"which is highly overused where i am living i go all Shut the ***k up.I just need some advice to just chill out before things get really out of control