I FEEL LIKE I AM GOIN THROUGH HELL! help?

idk wats really wrong, i feel like i want to get in a fight and beat the livin $h!t out of someone, but at the same time i am in love. i always am sad and depressed... no matter wat happens.i try to act happy at school and wat not, but i cant! help!!!i am always in trouble in school and out!HELP!