What options do I have to treat my overactive chin muscle? (Photo)

When I smile, laugh or talk, my chin muscle tightens, sometimes so much that I can actually feel it and unsightly 'lines' form. The muscles have been like this since I was born. I used Botox 3 times when I was 15. It seemed to help, although I felt like the lower half of my face appeared more full, which I didn't like. I am more than willing to consider surgery if it is a reasonable option. I have always hated my smile and will do anything to not feel so hideous.