Oh my goodness, you are so, so very wrong. How attractive you are has nothing to do with the size of your boobs, I promise you. It's all about self-confidence. If you like yourself, other people, including guys, will like you too.
I do understand your anxiety, but trust me, small boobies are the best. Yeah, there are some guys who are only into big boobs. And the majority of them are virgins! Any guy who has actually ever been close to a woman knows that boobs are boobs, and most men love them all.
Now I know you won't believe me when I tell you you're lucky to have small breasts! I realize it's difficult at your age, but trust me, as soon as boys grow up and become men, the size of a woman's boobs becomes far less important. In fact, a lot of men actually prefer women with small breasts.
I'm a 36 year old woman and I wear a 34A bra, and you know what? My small breasts are possibly my best feature. I wear tops that accentuate how small they are, and I take pride in them. They're perfectly proportioned to my petite figure, and I wouldn't change them for the world.
And you know what else? If I go to a club or a party, I have no trouble attracting guys. It's a myth that all guys want big boobs. What guys do like is self-confidence. I don't try to make mine look bigger, I celebrate what I have, and guys like that.
As an experiment, try wearing a tight top some time, one that screams "I have small breasts, and I'm proud of them." I think you'll be surprised by the positive reactions you get.
Take pride in what you have, project self-confidence, and lots of guys will be after you!