18 yo, not growing any taller, but my jaw/chin still growing out, makes overbite look worse? how to make it stop? i thought bones stop growing by now?

Class III: The facial bones continue to grow after the bones responsible for your height have stopped growing. Know that all bones change with tine. As an adult you will have an entirely new skeleton every 7-8 years. Correction of your protruding jaw will require Orthodontic treatment and possibly jaw surgery. See a fully qualified Orthodontic Specialist for free Initial Examination.