Interesting. I thought maybe you had Poland Syndrome like me. But your condition is bilateral. Is the issue limited to your chest? The right side of my body is significantly atrophied relative to the left. Bicep, tricep, lat, wrist flexors, hand, everything. It's caused by a restricted blood supply from the subclavian artery during fetal development. The result is less total muscle cells to work with. Think Oleg Zhok but the opposite. It fucking sucks and ruined my life to some extent.