P.W.
I favor the other side, so I have the opposite problem, because I'm right handed. It's totally normal, and I just wouldn't worry about it. I've been trying to start on the small side more frequently, and that way they sort of take turns, which breast is larger, but it goes back the way it is because in the end I still favor holding my son on the left side. If you want to get really serious I would 1-wear a padded bra that won't show the difference and 2- pump after feedings for 5 minutes just on the small side to increase production over there. Don't be self-conscious because other people can't tell.