There was certainly a lot of naivety/ optimism about what you would be able to achieve when you got older. I was pushed into a niche study because my parents etc were certain it would be possible to get a job if you just "worked hard enough".
I also worked in a few industries, storage etc. That sucked the life out of me as well.
So yeah, being told everything will turn out awesome your entire life is not a good thing. People tend to be a bit scared of pessimism, but they fail to realize you can be realistic without feeling hopeless.
Maybe this is too personal, if so you don't have to answer. But I've seen you mention millennials and various negative aspects connected to it, so I've become kinda curios what in your life has made you cynical (?) or pessimistic about that. Is it a trend in the general population that bothers you? Is it a manifestation of disappointments in your own life you realize others your age also fell trap to? Other stuff?
If you ever made a thread about this stuff, it would probably be grounds for some interesting debate