Naturally enhancing chest size?

Hi, I'd really appreciate some help with this. I'm a smaller girl in my mid-teens and I weigh about 108 and I'm 5'2. I guess I'm a pear body tips because I've got rather large hips and a normal sized butt, but I'm a 32A on my chest and I feel like it looks really out of proportion. 
I don't want to take any medications or whatever to help me with this, and I'm certainly not having any surgeries so does anyone have any advice? Weight gained seems to go right to my hips and legs so.. yea.