How can i look older?

i sorta have the same problem. im a sopre and not only do i look young but im 4'11. and yeah everyone always says "you will be greatful when your older" but of course thats a long time from now! so id just say dont wear your hair in a ponytail/ponytails or anything, wear make up but dont over do it, and keep dressing maturely but again dont over do it because it will just seem like your trying too hard ya know:)