I'm only 18, so I wouldn't say I know everything on the topic... but while there might be a chance that you grow out of it, most likely you will not. Sorry! I'm just not to much into the "false hope" thing.
While you do still have some time to grow, there is no way to tell weather it will get better or worse, and there really isn't much to do about it. Sorry kid! Haha. Only time will tell! Maybe they will even out.
For me, i noticed I guess around 13 years old that they were uneven, not to bad though, i always thought to myself i would grow out of it- nope. It got worse, but since my larger side is only a B cup it isn't noticeable when wearing normal clothes really. My bra helps that! Just remember that pretty much all women have some asymmetry! (It seems most women only have a small amount of asymmetry, like hardly noticeable even without clothes.) So asymmetry is normal, and not usually anything to do with a health risk- but unfortunately we are just part of the unlucky 10 percent (or some statistic like that..) with a noticeable difference!
If it does get worse over time you can always find ways to dress to make your figure look better... or maybe you'll be like me and wearing clothes nobody will even be able to tell! I just get self conscious in swimsuits and i've never let anyone see me without a shirt on. No big deal though so far... Most of the time people say that guys don't care and they still think your sexy, they are just glad to see boobs- any boobs! I haven't tested this theory yet, and probably never will. I don't care about what the guys think. It's about ME! And it's about YOU! And how YOU feel. I don't like the way i feel, and i'm having surgery to fix it. I want to wear swimsuits and be with guys and not be self conscious. Not that i have some horrible self image and hate myself- i just have the opportunity to feel a little more sexy, a little more "normal", a little better about myself- so i'm taking it. Maybe you will be a more confident person than i am, and that is amazing!! Whatever you choose is about YOU and about making you happy. (: And there are always padded bras and non-revealing clothes and just being confident. Confidence is the most attractive thing a you can have.
But maybe you won't have to worry about any of it at all! Time will tell, sweetheart. And until then- don't worry about it one bit! I'm sure you are a beautiful girl. Good luck
