I would like to know what i've done to a bone in my body?!?

i have really hurt a bone in my chest it's just below my shoulder height and in the middle of my chest ( i don't know what it's called) i really hurt it by doing a flip on the trampoline and and landing it really wrong...i'm not too sure how and it still really hurts the pain went away then a tried... show more i have really hurt a bone in my chest it's just below my shoulder height and in the middle of my chest ( i don't know what it's called) i really hurt it by doing a flip on the trampoline and and landing it really wrong...i'm not too sure how and it still really hurts the pain went away then a tried to open a stiff door and it came back i would like to know if it's just bruised or something serious (: thanks
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