I fell on a friends knees with hard impact and my chest hurts like a borken bone would

Hi Dulan,

You can break your sternum, the bone in the middle of the chest, but it is VERY tough.  You can also fracture a rib.  It could also be a sprain, there are lots of muscles in your chest.

Without knowing where you fell, it's all a guess.

If it continues see your doctor.