hey guys im new to the forum.  my issue kind of hard to explain but i would GREATLY appreciate any input from those of you with experience.  when i was born i had some sort of malfunction with my sternum, had surgery and it was fixed. however, since then ive had an incredibly hard time building my lower and inner pecs and ive searched all over the internet and read into all kinds of magazines trying to figure out what i can do about this but all the answers ive found are not very impressive.  Ive always been more cut up than my friends in the arms and abs department but the lack of a serious chest is kind of a real confidence downer for me.  I am seriously looking to do whatever it takes to make up for this (short of steroids) so any help you guys can offer me is greatly appreciated.  heres a picture of my current state below:
 

the pictures to dark to see

I think you should consult a doctor. AN orthopedist if Im not mistaken. He can probaly determine the cause of this kind of problem better than weight lifters who do not have knowledge of the surgical procedure in question.