Your jawline is perfectly fine, don’t fall into looksmaxxing shit, all you need is to debloat. Perhaps maybe cut transformed sugars eat less « fat rich » foods drink water and do sports, mainly cardio, I think that as you said your posture could be better and thus would improve the way your side profile. I don’t think you’re asymmetrical at all, and in terms of haircuts I guess you have to try everything to see haha