My gut feeling is the gen-Zers doing well intellectually / athletically are probably top 10%, and they dont correlate much with mental health issues. The average teenager is shallow and dumb, constantly looking for validation.
I'm so sorry you feel that way. But I think it says more about your unfortunate perspective of the world, rather than how the world really is.
I hope you can learn to have more empathy for others at some point, regardless of their age.