To be honest, if you cannot save up, then you simply can't afford a mortgage. Bear in mind, home ownership doesn't stop with paying back the mortgage. You have council tax, utilities, TV licence etc on top.
So if you cannot save at least 1200 a month, you can't afford to live alone.
From my own staff, they seem to think they should be able to live in a fabulous, brand new flat, still go on at least two holidays a year, have an iPhone, and eat out at least once a week, as well as run a car, and buy new clothes every week. It's simply not realistic at the start of your career.
When told this, they make excuses for their decisions, such as:
I gotta have a phone.
Everyone needs a holiday.
It's only Primark clothes.
I can't live in a cheap area, it's not safe.
With money, you can only spend it once. For every £500 you spend on a holiday, that's £500 you're not saving for a deposit. For every £50 night out, or £50 spent on clothes, ditto.
I bought my first flat at 21. I put down a 50% deposit. I had no family money, or help, just savings. Mortgages were hard to get in those days too. I had to have an interview for mine. Interest rates were 15%, so my mortgage cost me half my take home pay every month.
It's never been easy.