Can be done to fix my protruding chin?

Several options: A critical question is whether your teeth fit together normally. If they do, a genioplasty can be done: the bone of the chin is cut and recessed to yield a more normal profile. If not, the problem may not be isolated to your chin but may be caused by an abnormal relationship between your upper and lower jaws. See a craniofacial, plastic or facial plastic surgeon with experience in this area.