You are not mentally ill because you are depressed, anxious, or stressed. Moreover, the argument that such experiences are due to an "unbalanced serotonin" alchemy is nothing more than a lie that pharmaceutical industry and well-paid scientists keep telling. That's another reason why I became disenchanted about the work I do; more often than not I see money being spent incorrectly and data-driven stories being severely edited so they can lead to more and bigger research grants. The lie about antidepressants, for instances, is just an example of one of those lies that became true to the extent that today many people attach themselves to the story of being mentally ill and to the need of swallowing higher and higher doses of antidepressants. That's how they have been conditioned to see and think about their subjective experiences, while a few people get richer and secure their jobs on and on.