How to make an athletic body look feminine?

i know loads of people say ''athletic bodies are amazing,'' etc etc...but i think it just looks plain masculine and i hate it. i have a great *** and legs, and a decently toned stomach...but my upper half? horrible broad shoulders and back and no breasts. like an aa cup. im considering birth control pills, and im going to buy push up bras or those bombshell bras from Victoria's secret, but not until i move out of my parents house...so what clothes do i wear to make my shoulders look small and boobs big? i look horrible in dresses because of my flat chest and the straps emphasize my broad shoulders, so never wear them, and i have to stuff my bra with toilet paper an inch thick. it's not nice and i have bad self esteem issues because of it. i want to talk to my councillor about it but it's not something you can easily talk about is it? it's so embarrassing! so please help? im in the uk btw, so shops in the uk where i can buy nice clothes at a good price that would suit my figure would be great please