seems a bit like a younger person who is now going through some trauma about how much influence they really have vs how much they imagined they had when they were 12

This really resonates. Unfortunately I think that's right. Having this epiphany, this existential correction, about ones self, has either the possibility to create true life long wisdom or, irrecoverable life long self loathing, and from my experience it comes down to the quality of this person's relationships to lean on when confronting the internal fear of mortality.

So it's sad to see but this is another example of the latter and not the former.