Your jaw doesn't define what person you are. The surgery may make you look better(and maybe disappoint you depending on your expectations), but it wont change you on the inside, so if you can't be happy without the surgery, chances are that the surgery wont make you happy. It's easy to chase something thinking that it will make everything better, but the change for happiness must come regardgless of surgery. Distract yourself from the surgery, it comes soon enough and start doing things that make you happy directly.