I think the real answer to "mental health" vs. "laziness" (esp. given I've dealt and still deal with mental health issues personally) is that only you can honestly assess which is or isn't holding you back - and so the best thing to do is not make "I know better" pronouncements about other people. Introspect yourself (Socrates said, after all, that "the unexamined #LIFE is not worth living" and all), but withhold judgment from other people about things that you most likely cannot know in anywhere close to enough depth to be truly fair. You don't have direct access to their internal mental state, so you can only theorize things at best.