Both my wrists crack together and you can feel the bones grind together. it can be painful and achy.whats wrong with my wrists?

You are limber: We see this in limber people and it is called benign hypermobility. Your physician can clarify this issue.

Hard to tell: These certainly could be signs of early arthritis but just as likely to be mechanical with tendon damage. Impossible to tell without more information such as if there is swelling when it hurts or any other symptoms you should see an orthopedist to check