Anger issues........?

The smallest thing will set me off and depending I could be mad at for hours or days and I do hold grudges and when I get mad I forget everything during that time span I play lots of video games cause theyre my social life its how I talk to other people I dont hurt anyone or animals I just scream and curse sometimes I just get a knife and sharpen sticks sometimes when I do get mad I am sad and or I feel stupid afterwards I hold in everything during school cause I would get kicked out if I didnt and let it all out when I get home Im getting a job and I dont wanna blow it so please help me I wanna keep this job and not get fired cause of my anger... I am afraid one of these days I will hurt someone or something like that I dont take any form of criticism at all and if someone says Im wrong, says a movie or a game I like sucks I get really mad