Different sized boobs.

So I have 2 different sized boobs. I wear a size B bra. My left boob barely fits in the bra, while my right boob doesn't even fill probably half of the cup. Is there anything I can do to try and help even them out a bit? I'm very self-conscious about it. I have to wear nursing bras at 17 years old because those are the only bras I can get to cover both boobs. I've talk to my doctor and he just said that I should breast feed twice as much on my right boob than my left when I have kids. I haven't​ been to a gyn about it yet. I've tried silicone cup things to stuff into my bra, but they were just super uncomfortable and my left boob was still bigger so I just kinda gave up on it. My left areola is definitely a lot larger than my right one too. No one in my family that I know of has this issue, so I don't understand. I know a boob job is always a possibility in the future, but I wouldn't get implants so I'd basically be left with super small boobs. Any advice would be great, thanks.