My right shoulder is continually in a lot of pain. probably as a result of carrying around a back pack in high school and college. what do i do?

First diagnose: Chronic unilateral shoulder pain in twenties male likely soft tissue (tendon, ligament, or nerve) injury. Hands-on functional evaluation by an osteopath advised. Imo massage and physical therapy should be undertaken after diagnosis entertained, and pursued exhaustively before any surgery is considered. Absent a mechanical injury, imaging studies are marginally useful.