How do people do it? IME the ones where you wonder have one of: Free money from parents to wipe out the mortgage, had kids late in life so they've got tons of savings and have been promoted well at work, free childcare from parents or a 'stick it on the mortage debt' attitude. For the rest of us, we cut our cloth so to speak.
You do have control over this, there is no point getting angry, do something. If you just want money for fun then make sure you are on the cheapest suppliers, sell all your junk, meal plan, shop carefully etc. If you need a bit more evaluate what you need, probably don't need two cars, sky TV, mobile phone contracts, gym memberships, foreign holidays, monitored house alarms, car breakdown membership for instance.
If that isn't going to do it and you don't live there already then get more radical, think about moving to a cheaper area, smaller house, changing jobs. There are ways.
For us, I saved like mad while trying to get pregnant and we now live on one income, we have no spare money and have holidays and big purchases like car seats out of the savings, but once they are gone, they are gone and that is scary as I want 3 DC (have 2).
There's no point posting our income as it's not relevant without knowing our mortgage size and type of house we live in but 50% of our money goe son the mortgage and we each have £100 a month to spend on what we want, I always spend all of mine and want more but it does. My gym membership and contract mobile are a thing of the past.