My chin is round with a dimple, and I hate it. Can this be fixed? (photo)

There are several treatment options. You can have HA filler placed into the dimple to make it less noticeable. Sometimes subcision is required where the fibers beneath the skin are released and a filler is injected. I have experienced good results with a filler called Bellafill that can lasts up to 5 years.The same can be done using your own fat. Good luck

Hello dear
Thanks for the question and provided information as well. 
My recommendation for you is a personal consultation with a certified plastic surgeon to be able to make a complete evaluation and suggest the procedures that can fulfill your expectations and provide you with the best results.
Good luck :)

The combination of bony reshaping and far grafting of the dimple, done through a submental approach, would provide an effective change in the shape of your chin.