I want to look nice, but i dont want to be a tease?

Okay so i have big boobs and a small waist and i've always been made fun of for it but recently (since im now in high school), i've started to get attention from boys WHICH I DONT WANT. I mean, i want to dress stylish, wearing all the clothes that are in fashion. But its hard for me to pull them off without adjusting them in a way that is kind of... whats the word.... racy? lol idk. So... what are some ways i can cover up without looking like a nun?