That's funnie.
It is fixable!
For the most part, people's bones grown evenly so I doubt it's a bone structure thing!
I think I heard somewhere someone saying that whatever dominant side your body is, it will be slightly larger..
Like right handed folks, their right side is slightly bigger.
But yeah, I would say work out unilaterally.
But it shouldn't grown unilaterally since you probably work out evenly anyways!
Don't know what to tell you... I guess you could do alot of cardio and get your body small agian and then start from the beginning!