Stubborn Double Chin, Weak Jaw line, Jowls and would love to make my chin slightly longer! Advice? (photos)

I am a 26 year old female and have always had a very stubborn double chin and a weak jawline. I am 5'7 125 pounds and am very happy with my body, but my double chin, jowls, and all in all weak jawline are killing me! My chin is also slightly weak, whenever I take a photo from the side I don't know how comfortable I feel about having an implant placed on my face so I have been looking into sliding genioplasty, and also smart lipo for the chin and neck! My concerns are nerve damage, and lumpiness!