In the real world lots of people secretly feel like the OP - why do you think we've had so many years of the tories?
And even though I disagree with the OP, I understand the bitterness when you do everything 'right' and are still struggling.
However, the real problem is that wages have fallen out of keeping with the cost of living in this country. Anyone working full time should be able to find a modest lifestyle free from acute worries about money IMO (obviously there are variables). The anger is best focused on financial greed and poor politics than people on benefits though.
When my DC were tiny and I became a homeless mother of two following an incident of domestic violence, I carried on working full time, bought a house and never claimed benefits other than CB. I would have undoubtedly been better off day to day by giving up work and claiming. My friends on benefits were able to afford to meet up for coffee while I couldn't even afford to feed myself. The reason I didn't resent this was because I had the sense to realise I had something they didn't at that time - a pathway to a better future.
When the kids grow up and the benefits stop, where are you left?
20 years later I own my home, have a great career and don't worry about money. One of my friends started working when her child started secondary school and she didn't need to worry about childcare for work. She's better off than she was but will never be 'well off'. Another friend whose physical and mental health is very poor now and whose confidence is on the floor won't likely work again and lives a hand-to-mouth existence on benefits (including PIP). She has no way of improving her life and slid further into poverty once her DC grew up, moved out and the benefits stopped. She's a lovely person living a miserable life. If life were fair she'd be a millionaire, but it isn't.
So FF a few years OP. Your "friend's" DC will grow up. All the child-related payments will stop. She could easily end up like my friend if her MS deteriorates as might be expected. Whereas you could be sitting pretty by that time. You have a future with lots of possibilities and promise. Hers are far more limited. Don't resent that. Resent the fact that we live in a low wage, high cost society in one of the richest countries in the world where wealth could definitely be spread more equally.