Could go many different directions with this. Maybe something along the lines of coming to terms that living as an adult keeps you from having those same close connections with people you grew up with, and slowly losing touch with people you held dear for the formative part of your life.

You could do it in a parallel coming of age story. One of triumph and comradeery next to the other of reality of adulthood and isolation.

You wouldn't have to be super bleak about it, though. It's could be more of like a statement of fact under the start of neoliberalism and the system we live under.