I know what it is, I'm a nurse. It wouldn't bother me at all. Stuff happens and good women care about YOU, not a minor anomaly in your chest.
Building up the muscle is a good idea, usually APC only requires surgery if it may press on your heart or other organs or already is doing so. If your organs are not in danger, but you still feel terribly self conscious about it, you could talk to a cardiac-thorassic surgeon about what could be done.... but if there isn't a medical problem going on, I don't think a surgical solution is necessary.
But, if it really bothers you (and it wouldn't bother me if a man I was interested in had APC) a lot of good cardiac-thorassic surgeons would do what they could to make the surgery "medically necessary."
But, that's just an option. Like I said, if your organs aren't at risk, I wouldn't worry about. But, please
for Nurse P'Gell, make sure your doctor does keep an eye on it. It's one of those usually benign conditions that do need to be kept an eye on by a medical practitioner.