I tell my coworkers I keep work and my personal life seperate. When I'm at work I'm focused on working. I make small talk and I'm polite but I'm busy and people respect that and I've never had any issues.-
I have absolutely no idea what I'd do in a workplace like yours. Probably die from socialization overdose.
You could ask your manager what they mean by opening up to coworkers because that sounds extremely abnormal. You could also try interuping the conversation everytime the coworkers talk to you "sorry can't chat I'm working on something right now" then eventually they will give up. Eat lunch alone and tell them you prefer it that way. But it is good to make work friends to pass the time.
Why is the video cut like that? Is there a longer version?