I always wonder when an "epidemic" gets reported if things really have changed or if we just recognize it better. When I grew up, we had a lot of kids (including myself) with problems like depression or not fitting in in other ways. Back then they were just labeled as "slow", "stupid" or "difficult". Nobody thought about mental illness or ways for addressing these issues.
Not fitting in is not a mental illness. And this attitude is behind the prevalence of many mental illnesses today. We've gone from a society that embraced difference to one that claims to embrace difference while mandating sameness. TikTok, Instagram, Facebook, etc, are all toxic for this reason.
It causes mental illness like depression and also stunts social development.