First, note that answers on eNotes are for study purposes only and should not be read as actual medical advice. In order to get good medical advice, you need to visit your healthcare provider who will closely examine the problem to provide a diagnosis. No one can give an accurate diagnoisis over the internet, and asking questions of strangers online can result in your getting advice which is either useless or harmful
Shoulder dislocations can damage the joint or surrounding ligaments. Especially if you intend to engage in athletic activities and have dislocated a shoulder in the past, you should work closely with a physical therapist to strengthen the muscles stabilizing the joint to prevent future injuries. Your health care provider can also run tests to determine whether you have done permanent damage to the joint or are merely suffering from limited range of motion and muscle imbalances due to previous injuries. In general, any injuries which affect joints (as opposed to things like bruises) are likely to require a professionally designed exercise program for full rehabilitation.