I have a pectus excavatus and my rib cage is bigger on one side and it´s not hurting and not making any probleme. And I can fell like the bigger one is more further than the other. Here´s a pic of my rib cage
Eeesh
do you think its normal
As long as your shoulders and spine are straight and not lop sided or curved then you have quite a minor condition. Ask your doctor for some exercises as it may be due to muscle weakness on one side. Build up the muscles and it wont look so different.