Boobs go in and out of style. 100 years ago girls used to wrap cloth around their chests to flatten their boobs for a 'boyish' figure. In the 50s bras were designed to make boobs stick out the furthest, not the biggest size but the most extension.
A lot of guys like the smaller boobs! I kind of do myself (frankly, I like ALL boobs.) Also the smaller ones don't migrate south when you get older.
Finally, while big, juicy, round boobs might attract guys (for the wrong reason), when a man finally falls deeply in love with you, it will be because of who you are, what you're like. He won't care what kind of boobs you have!
Girls your age always hate their bodies. But you're still not through growing just yet. Just try to relax.