Chin ups would not have changed the structure of your chest or spine. They would not have caused a scoliosis
. You may have a scoliosis or a chest wall deformity
accountable for your asymmetry. They are not caused by anything you have done to yourself but simply they way you were programmed to develop as you grew. I am assuming you are now an adult and so the asymmetry you are seeing is unlikely to change either spontaneously or by you exercising or body building.