Can't manage to do my homework?

Okay for some reason i can never get to do my homework, on quizzes and tests i get iver 85% everytime in almost all subjects, im 15 in grade 10 is something wrong with me ? i always get distracted go out with friends to play basketball, play ps3, go on facebook instead of doing homework, i try hard to do it but just cant manage its like im the opposite of addicted to homework. For example my homeworks lyin in front of me right now... its prob gonna take me an hour - andhour and a half to finish but i cant manage to start. Help pleeeease ;(