Unknown Skeletal Disease.

Hello, everyone. Ever since I was in high school, I developed a deformity on my chest. My left chest bone sticks out more than my right one. It's hard for me to be shirtless or wear one shirt. It's pretty noticeable. I believe is Pectus Carinatum, but a doctor told me it possible comes a genetic disease to a mild Marfan Syndrome. I had a test done for Marfan Syndrome, but it was negative. So, till this day it is not sure what I have. It really affects my self-esteem because I feel I can't relate with other men. It would be hard for me to find a woman to care about me even with this condition.:(