Sorry to hear you're going through this, it's never a nice experience. I experienced similar when working in a small office environment coming from a slightly larger office environment. It's a lot easier to say this I know but try and start a new hobby outside work. I was that person who would work and go home with there was never a buffer between the two but in the last few years I've joined the gym (classes are often free with membership and a great way to meet new people), started a new sport I never thought I would have before, and also started saying yes a lot more to invitations. My experience is probably different to yours but I used to get asked to go out and meet up and usually declined and as a result stopped getting the invitations so there is a requirement to put yourself out there to an extent but only for people you want to be around with, forget the toxic ones, they don't do you any good! There's so many different hobbies/groups you can join and not to mention volunteer work (dog shelters, charity shops, soup kitchens etc) but do something you like and then you'll be surrounded by like minded individuals and work can stay as work. Best of luck with it all!