How can I shorten my super long chin? It gets even worse when I smile. (photo)

You will require a surgical reduction of your chin to get the appearance you desire. Typically, the chin is reduced by either shaving layers of the chin bone to the desired contour or cuttin the chin bone and sliding it back into a new position. Both methods will require an incision that is hidden inside your mouth behind your lower lip. Hope this helps. 

The chin can be reduced, and the soft tissue can be managed appropriately.Kenneth Hughes, MDLos Angeles, CA

If the problem is in the chin are alone, then sliding genioplasty can help to shorten the chin. I do not recommend shaving.