Oh hello.
See my comment above - this is precisely the attitude I was talking about.
First generation university student. We hardly went out at all during our 20s, as we saved every penny we could and worked incredibly hard. We have really lost out on things we will never get back as a result - we have fewer hobbies, have missed out on so much fun and just general chilling out and not working - which there's no way we can do now with young kids. We rented a flat so cold you could see your breath in bed, as it was the only way to live in London and save from our initial graduate salaries. We have done all nighters for work. Time and time again. I once cancelled attending a friend's wedding for work. I don't buy designer clothes and we've never owned a car. My husband and I have worked HARD. Our extended family can't quite understand the hours we've worked (and often continue to work - although it's not quite as intense now in our 40s).
I would be willing to bet I've probably worked as hard as you. As a result, I will be hit by mansion tax and am already paying VAT on school fees - I feel it, but I'm glad to. It's the right thing and the fair thing.
Because... the most important bit of your comment is not "I worked damn hard" - it's "lucky". You are comfortable because you worked damn hard within an economy that rewarded that hard work - not in a broken system where you can chase and chase and chase your tail and never get your head above water.
Plenty of people work hard and are not anything like "OK" - and if we let them sink, we will all be worse off. Not just in some vague lefty "equality" way, but in very real self-interested ways - a society this unequal is a society that falls apart in fundamental area. So if you want anyone to be working in the hospitals when you need them, or teaching in schools, or putting out fires - those who are comfortable need to step up. No matter how hard we worked. Be grateful that your hard work paid off - that's not a given or a virtue - it's dumb luck.
People who will be lifted further from the poverty line after the child benefit cap is lifted are not the problem. They are a drop in the ocean, and the "feckless" ones are a drop of that drop. The right wing press just foregrounds them every chance they get, so working people turn against each other - instead of looking up at those hoarding more and more wealth and resources. You are looking the wrong way. You are angry at the wrong people.
I'd recommend a YouTube channel called Gary's Economics - really smart economic analysis from an ex-trader. He explains things really well, and he's on your side.