When I was younger, I broke my arm close to my growth plate near my elbow. As a result, part of my arm grew and the other part did not, resulting in a boomerang shaped arm (if I hold my arm straight out, it looks like a boomerang). Normally, I can hide it very well with long sleeved shirts or a jacket. However, I was helping someone move some things yesterday, and because it's warmer outside, I wore a short sleeved shirt. They noticed my deformed arm, and they asked me if I needed any help moving anything, and it was embarrassing. I told them I was fine and didn't need any help, but it left the both of us in an awkward situation.
How do I let people know that my deformity doesn't disable me at all, without making the situation awkward?