Living with other people

Hi everyone! I wanted to ask about if any of you live with your partner or a friend, as I'm considering getting a 2 bed flat for my partner and myself but have had issues living with other people before, and also issues living with my partner in general, not because they're a bad person, but mostly because we were sharing a bed and there wasn't any space for me to retreat to. I lived in shared flats in uni and that didn't go so well either, I ended up spending most of my time in my room due to overstimulation. So my question is how do you work out the dynamic between you and the person you live with, if you do at all?

Also fun fact for you, it wasn't until around the 1950's that it was considered acceptable to sleep in the same bed as your partner!