I've always been skinny but the muscle under my chin makes me look like I have a double chin. How can I improve it? (photo)

Ever since I was little I have been a very natural low weight very skinny, however I have always had a undefined jaw line. It doesn't seem like it's fat, it looks more like it's muscle. What cosmetics procedures can be done to eliminate this and how dangerous is the procedure? I only worry because I am an actress and it diminishes my confidence because my side profile is not aesthetically pleasing.