I have trouble falling asleep at night and its really affecting my mood. please help i h8 my situation.?

it takes me a minimum of half an hour 2 fall asleep, some nights it takes up to 2 hours or more, just lying awake for hours and its puttin me down. i need to sleep for at least 7 hours a night as my mood is gettin really bad and my family are suffering as well as me.