Personal female question :]?

You can get chicken fillets which work quite well as you cant see them, even under singlets because they sit in your bra. During the summer if you are wearing a bikini and plan to swim you could probably still wear them in your bikini top as long as you made sure they weren't going to slip out which would be mortifying. but i would recommend getting a bikini top that is padded with an underwire. Also most peoples arent developed by 15 i know mine definitely weren't. As soon as you go on the pill they usually get really big though which may be an option for you, otherwise you should be happy being able to wear little tops and not worrying they will fall out while they are small, enjoy it because it probably won't last anyway.