first off, youre much better looking than the average guy, especially from the front. thats mainly due to your features.
second, your bone structure is quite weak, as can be seen from profile. If you really want to fix this you can get jaw surgery but often times in cosmetic cases like yours the risks are greater than the rewards. the exception is if you have a real identity issue, or its causing some functional problem like to your breathing or posture. Rico on this forum said it best: surgery is your enemy, you can fight that battle, and maybe you will win, but maybe not.