This may sound like a stupid question but what is exactly the problem? Do you have pain? does your shoulder problem influence your work or sport enormously ?has there been an accident in the past?recurrent dislocation???? We are not built symmetricaly. Shape of thorax spine and ribs and state of the muscles joining shoulder blade to body influences how the shoulder blade lies and therefore also direction of the "socket" of the shoulder joint. We can always influence muscles and function but can't always iron it all out when nature gave us an asymmetric body.