Nicole, I just want to add that you are absolutely spot-on with a bulk of your observations in this piece, so thank you for speaking up for us Millennials! -- since everyone else just seems to want to drag us...no matter how young we were, or how old we become.
I wrote a piece, semi-recently, dealing with Millennial culture -- and, although I didn't delve too deep into the effect of Columbine on us (I'm saving that for a future article), I'd love to hear your thoughts if you ever have time:
https://medium.com/resonates/confessions-of-a-gen-y-kid-anti-kiddie-ageism-558ff9663922