So sorry to hear that you have been suffering from this pain for some time, and hope that we may be able to provide some information that could help. First and foremost, with any sort of chest pain, it is always important to speak with your doctor
. Even though you may be young and healthy, and even if this may seem like something that has a ready explanation, it is important to make sure that there is nothing more serious. It is unfortunately true that many young and healthy people ignored warning signs that turned out to have devastating long term consequences. Now, from what you describe, it is certainly possible that you could be suffering from conditions involving the chest wall, among other possibilities. Costochondritis is one such condition, where the cartilage of your rib cage gets inflamed and causes some pain. It is possible that the cracking that you did for so long caused some inflammation of the joint that is causing some associated pain. The best way to find out would be to speak with your doctor to start the next step towards treatment. He or she may recommend treatment with over the counter medication. Please speak with your doctor for more information, an accurate diagnosis, and to begin some sort of treatment.