My Bones Dont Sound Healthy?Help!):?

im only 13 and my bones in my legs and hips crack and pop when they move at all. it hurts a lot. I Was doing side leg lifts and my hip keept poping and the othe side doesnt do that. last year i fell off a barn up on a second floor. i land straihgt down and it messed up my back a BUNCH. i went to the hospital because of it. does my back cause my hips and legs to pop and hut too? if not why do my legs do this?