The fundamental problem here is that since you (and I) are anonymous, there is no real way for us to communicate what we believe a "reasonable" muscle mass is. Even if we try to be specific and talk about specific numbers and mass indexes and how much we can bench, it's still futile. The nature of body disorders is such that somebody can have laughably incorrect beliefs about themselves without consciously meaning to lie. We could tell each other our BMIs but if we both stay anonymous, it's all meaningless.