I think the difference is, is that we are the first generation that doesn't have it so good as the generation that came before us. Prior to very recently, every generation has seen an improvement in living standards, food quality, education quality, healthcare, job prospects and promotions etc.
The baby boomers had the best of everything. Then for gen x-ers, we've had more of a fight for jobs, we got lucky with the housing ladder, NHS was still functioning somewhat.
For millenials it became even harder, they missed the boat with the property ladder and huge inflation of the 2000s.
As for gen Z and gen alpha - I don't know what will happen to them. No wonder they are so depressed and full of mental health issues. Tens of thousands of debt if they go to uni and a massive fight for jobs once they come out, many just paying minimum wage. What was the point?
So as a species, we are in decline. It's the same across the Western world, even in China. We are not seeing an increase in standard of living and material wealth. We are seeing a decline and we are seeing a sharp decline further so for our children. And that's impacting the fertility rate and whether or not you choose to have kids. Our decline is very very clear. We are not even reproducing like we used to. That tells you something.
Largely it has to do with housing costs from what I can see.
Back in 1990s/2000s you could rent a room in London for £400 to 800 and get a decent place in Zone 1 or Zone 2 and you'd still have money left over for everything you needed plus more. I had dinners out, went to the pub, to theatre, cinema, on holiday. I didn't think about money and I wasn't on a huge salary. I had enough and I always had hope for more, for better, for what my parents had...
We just didn't worry about housing costs as much. Now, housing is extortionate. I'm not sure population growth, wherever it's come from, has been good for us. The pressure on housing is immense. We've also not become anymore productive as a country for many years now. We just bubble away at the same rate, over and over and yet things get worse.
Thames Water is bust. Many councils are bust. The government is in massive debt. NHS needs ever greater funding.
Private wealth is through the roof. We need a wealth tax and fairer distribution.
I'm sorry OP. You are not wrong to feel aggreived, it's the narrative we've been sold and told would happen for us too. But I'm not sure what can be done or where we went so wrong.