If the house you rent is similar to those at 500k then the (current) gross yield is less than 3%. This implies your rent is exceptionally low as 5%+ is more typical.
So for something similar, even with a big deposit, you should expect the mortgage to be higher than your current rent. Or as other have said, look to buy something more 'modest' if you are concerned about high mortgage payments.
The other thing to bear in mind is current house prices largely reflect years of 'emergency' ultra low interest rates feeding into mortgage rates of 2% or lower.
Now interest rates have returned to near-normal (and assuming they stay there) there will be an inevitable decrease in house prices as buyers can now borrow a lot less for the same monthly payment, with mortgage rates closer to around 5%.
However, it will take time for this to work through the system as many sellers either can't take the 'hit' of a reduced price (even if in theory their onward purchase should also fall in price) or won't sell for less than they think their house is 'worth' (usually based on sales achieved when interest rates were ultra low).
All major indices (Nationwide/Halifax/LR) are showing stagnant or falling prices over the last Quarter. All major banks are also predicting 5-10% falls for the next year/18 months.
So if you are happy with your current rental and the rent continues to be very low then you could consider a delay while you track whether properties of the type you want to buy start reducing.
In the meantime, you should be able to easily get a decent interest rate on the deposit you have so, all other things being equal, you would need to borrow less even if prices stayed the same.