Chronic Rib pain - 11 years

I am a 24 y.o. white female. I have suffered from chronic rib cage pain since I was 13 y.o. I have had bone scans, breathing tests, x-rays, an echocardiogram done and have seen too many doctors to count. Nothing abnormal was found in any of the tests.

the pain is chronic but inconsistent. It peaks when I exercise or if anything touches them (even my bras hurts). Once a peak occurs it takes days for the pain to subside. Deep breathing also hurts. I have a family history of Marfans syndrome and my uncle had his rib cage broken and reset when he was just a boy because they were so badly formed. I feel like mine are not formed properly either. Some of them stick out further than others and even though I am not underweight the spaces between my ribs are easy to see. None of these abnormalities are extreme but I do wonder if they contribute. I do not want anything suggestions for the pain I just want to know what is wrong. Any information that could lead me in the right direction (or any direction at this point) would be appreciated.