I'm 16 but I look 12.. How can I look older?

I'm 16 gonna turn 17 in september but I look like I'm 12. I think mostly because I'm short, I'm 5'1 haha personally I think in okay looking.. But for like a 12 year old >.< my hair is cut and styled in like a scene or emo way. How can I make my face look older? I just wear eyeliner. But I dont want to wear heals. Thanks in advance :D