I need help Diagnosing My kid?

My son in class will do the exact oposite of what he's instructed to do, if no one likes his Idea or if he doesn't win at something he will go either outside of the class and pout or to the corner of the room and quietly pout. If someone makes him mad he will threaten them with a fist or scream "HEY!". Plus he never listens. Also, he thinks every single comment is centered around him. For example a kid once explained that they were playing a computer game and if you lost you had to switch out with another kid so then my son lost and he wouldn't get off the computer so he pushed the kid and went to the restroom and once he got his emotions out the pricipal wanted to talk to him but he wouldn't listen so he ran up and down the hall screaming "Leave Me Alone Arghhhhh!". Eventually they had to drag him up to the office. The weird thing is he's not in special ED or anything because has pretty decent grades.