If everybody has at least one mental "disorder", then can that really be considered disorder at all? Then who's to decide what's "normal" human behavior and emotions, and "abnormal" human behavior and emotions? If everybody is weird, then nobody is weird. It's that simple.

Aside from very serious mental issues like hallucinations, schizophrenia and the like, most people's issues, and even suicidal tendencies, seem to stem from some very basic mis-education from their formative years of their own worth, what's "normal" and "not normal". EVERYBODY'S mental health could be vastly improved with basic self-esteem and gratitude learning.

The biggest problem almost all of humanity faces is growing up in societies where high self-esteem is discouraged, everybody's compared to one another, and everybody's behavior is policed and controlled. That would drive ANYONE to be insane and miserable.