Why is my figure so feminine?

OK yahoo peeps, help me out! Just today i caught a glimpse of what i look like sideways in the mirror, and although I'm fairly impressed that I've stayed thin after all the times me and my friends have raided KFC and chowed down, my figure remain similar to a girls, a flat-chested one, but a girl nonetheless, my hair's length(and style) also did not contribute to making me feel better... My legs are rather slender, yes, slender not bony, but slender, as are my arms, and i don't really have a need to work out, so i've remained small, add to that my height of a whopping 5' 4", and top it off with all my shirts being size small, and you have a recipe for high school torture syndrome, help me out! what should i do to look less girly?(not cutting my hair)