Can my jaw be improved without surgery? Is there anything I can do to prevent my jaw from getting worse? (photos)

I've had braces several years ago (I'm 19), and although my teeth remain straight, my jaw seems to have grown. This current aesthetic look doesn't bother me but I seem to be experiencing pressure in my ears/I even wear a night guard on top. I have been told that I can have two teeth removed and wear braces all over again, but that definitely is not an option I will consider. Overall, I'm just afraid of wearing my teeth out in the wrong way and having problems when I'm older.