The dichotomy is explained by differences in mental-emotional states. Someone who's psychologically suffering, like yourself, knows and recognizes that they're strong because DESPITE their painful state of mind they still somehow function reasonably in the world.

Those not afflicted by such painful psychological states of mind, or who have never been in a place like that, don't have a personal reference frame to that horrible world but only see in people afflicted with depression or anxiety, etc someone who's complaining or feels bad because, they think, the person is weak.