It sounds like you might have a genetic collagen-type disorder or an insertional disorder (collagen tendon-bone interface). There are many of these disorders and I am not an expert on these. I cannot tell you where to begin but the search on Google might be helpful to start educating yourself.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.