it all evens out in the end

I'm talking about rent and mortgage in a city like London with only one salary. Yes, it's exactly as hard as you can imagine. Not easy on a single salary unless you're senior management level, want to commute two hours each day, or you are lucky enough to have your landlady be your best friend. Or you don't mind living in a shoebox pretending to be a studio. Otherwise, you'll be in a shared house.

I'm talking about holiday and travel, where either you go to hostel dorms of pay double price for a room in most hotels. And there are no packages for one, or barely any, and they are in singles holidays where the objective is not so much travel but stop being single.

I'm talking about doing shopping and producing more food waste than I'm comfortable with because everything comes in bigger portions than one person can reasonably eat. Even with freezing more than half of everything there will still be something that goes off because you were too slow to eat it if you do shopping once a week. Or you have to go shopping every couple of days and eat the same those two days.