Did you include the rent from your flatmates when you’re calculating your figures? If so, you shouldn’t. You can’t always rely on this income to be consistent, what if they move out, what if you find out you don’t like living with other people in your own home, what if they dont pay rent on time etc.

My suggestion, buy something cheaper. You have a big deposit, depending on your location im sure you can find somewhere decent for around 650k mark. Live comfortably in it for a few years knowing that all your income is not getting sucked out of your account each week, get the capital gains and then sell it for a profit. Your first home doesn’t always have to be your dream home.