I don't discount your experience, but in fairness, 15 is still a VERY formative period in a person's life, and it's still accurate to say that your development was heavily affected by what was happening at the turn of the millennium. The generations aren't defined by young childhood only.

I would agree though that the way we divide generations right now isn't especially helpful for making meaningful inferences about lived experience besides development of technology and wartimes. Things move too fast, and have since the 70s.

But it's also unhelpful to make too many micro-generations. I was born in 90, and I feel like my experience was vastly different than that of someone born in 95 or 85, but it's because I'm focusing too closely on my own personal experience instead of population averages.