How does anyone do this these days?!

I worked out that with a deposit of 15% on a £140,000 house giving me £700/month mortgage repayments over 25 years I can only break even with my monthly income if I....

Only spend £30/wk on food
Never go on holiday
Never buy any presents
Get rid of my car
Never buy anything else from a shop except my weekly food
Never travel to anywhere except work via public transport
Never buy any entertainment goods/tickets
Cancel all non-free leisure activities

Some depressing shit

https://www.moneyadviceservice.org.uk/en/tools/budget-planner/budget/edit/insurance-loans-banking