Theexwife
It does seem that normal reactions such as stress, anxiety, despair etc are classed by some as mental illness. Some have latched on to this term and use it to excuse bad behaviour and working.
I also think that many want a label, ADHD, Autism etc often looking for this label in later life when it makes no differences as they do not have treatment but again put negative behaviour down to a condition.
Young people do not seem to be copers preferring to shout the phrase mental health when challenged, not even using the phrase correctly, I have heard people say “ I have mental health”.
Actually it can make a HUGE difference to adults to be diagnosed as adults IF they are Autistic and/or have ADHD, often going together.
My adult daughter was not diagnosed with Autism until she was 23. It made a huge difference to how she feels about herself, having spent 10 years wondering why she felt so different from other people. It was also useful for her girlfriend and us, her family, to understand that she see perceives certain things so differently to us.
She had a copy of her full diagnosis and report lodged with her GP and her Head at school, this means if she does seek any reasonable adjustment (& thus far she has not asked for anything), she can freely ask.
My other daughter sought help from mental health services since she was 14. She went from self harming to being disrupted to very risky behaviour to attempting suicide at least twice (that we know of), finally earlier this year, privately, she got an actual diagnosis, is now on appropriate medication to her specific condition and other treatment offered.
I would add we were very supportive to both girls BUT we encouraged them to continue with their education, and then supported them both into work. They both work full time in quite full on jobs.