About three days ago I went shopping over at urbanoutfitters and although this is going to sound ridiculous it's made me self-conscious. I was standing in line to buy some stuff when I heard two guys from behind me criticizing my sense of fashion. Apparently my white shirt, dark jeans and chucks was too plain for them. I normally don't care because my friends are always giving me crap for dressing like a tomboy, but I guess that's the reason why so many people confuse me for being sixteen when I'm actually twenty.
I've tried dressing up on several occasions as far as wearing makeup and high heels, but that's not who I am. Is there anyway to make the "tomboy look," look chic? Or perhaps not young? Any advice would be helpful.

Thank you all