No idea what you're talking about. I'm a millennial and love my life. Sure, there are worse years and better ones - that's normal, but on the whole, I'm perfectly happy.
9/11 didn't affect me in any way whatsoever. I grew up in an Eastern European country, was 13 when it happened. Didn't pay much attention to it; it was a blip in history like any other. Obviously, it was a very tragic event, don't get me wrong. But for me, it was one of the many; it's not like it's a unique single tragedy that happened during my lifetime.
As for the internet and social media, loss of a 'simpler' life, I disagree completely, again. I absolutely LOVE it. The world is on my fingertips now. I travel a lot, go to gigs, museums, ballet, etc - the world is your oyster, just open google and you can find and book anything, in any corner of the world, any time of day. Internet shopping, banking, social media - love it all. And don't feel 'depressed and bombarded with negative news' every day, if I don't like something, I just tune it out. I would absolutely HATE to go back to the pre-internet and pre-mobile phones stone ages.
Covid lockdowns were fine for my teen, who is now almost 14, and fine for me. We just sat at home for a bit. What's the big deal? Sure, a little boring, but it passed, and we went back to normal life straight away. We facetimed (thanks again, internet!) with family and friends, and still managed to travel. No fuss, no 'terrible trauma', no whinging.