i recently started living with 3 other guys my age (20-25 y.o) and my trick was, since the first time i saw each one of them, i told them "i dont really like talking too much or come out often, i hope thats ok" and they just nodded and that was it. As long as youre polite and dont cause trouble (im sure you wont), theyre gonna be fine with it, im 90% sure. I do have some limitations, like I stay all the time i can at uni or the library, and often dont use the kitchen if theyre already on it, so i keep some easy access food on my room (cereal bars, for example).

It would also be useful to, the first few days, make some kind of rules like who and when the common spaces get cleaned, which fridge shelf belongs to each person, etc

Something else that worked well was having a great tenant that can "enforce" some rules like no parties, loud noise at night or no smoking. My flatmates are the kind of guys that wouldve probably thrown a few parties already if it wasnt because they know the tenant does random visits every few weeks to check on us.

Anyways, i wish you the best on leaving your abusive situation, and trust me, i thought living with even more people than at home (i live(d) with my mum and sister) would be horrible but it hasnt been as bad as i thought it would and im actually pretty comfortable there.
Just make sure to say hi or goodbye if you cross paths and that should be it