honestly anon, my jaw is kinda big too. If you're really insecure about it, you can add more volume to your hair to make the upper part of your head look bigger, hence more "feminine", but you also risk just looking stupid.
Or you can own it. Sharp jawlines are sexy. Go enchant people with your dorito chin, and don't give af what anyone thinks. Just accept that you can't control it and focus on what you can.