You're not in the position to be questioning anyone's self-esteem or manhood.
Billy is an iron warrior. A modern day gladiator during the times of generation nothingness. Each day, Billy is shaping, constructing, and molding his body into an art form. With the iron, he carves away at his physique. Day by day, his physique becomes sculpted into a statue. Billy's diet, well, Billy does not eat for taste or to fill his appetite. Billy eats to grow. Billy eats to ensure that the machine (body) is getting all the nutrients it needs to become a modern day masterpiece. Someone once asked Billy what he does for a living and his response was, "I am becoming." Meaning, Billy is in a constant state of "becoming" something greater than the day he was before. Billy doesn't have a "job" because he is always just "becoming." And when all is said and done, the result is a body that has been perfectly sculpted from raw iron, food, sleep, and dedication.