I felt like that, but a few years ago I went to university, and despite wanting to get rid of the distraction of Facebook so I could study better, I found I pretty much had to stay on there.
So much everyday organisation of groups and clubs, and even just general admin and social/convenience stuff at all levels (cancellations/changes to events, useful info, even things like people asking whether anyone in such-and-such accommodation had a DVD player/set of batteries/giant saucepan they could borrow), was being done primarily via Facebook. I'd have been totally out of the loop without it. Before I started the degree, I was on FB for the usual keeping up with family and friends purposes, but wasn't really involved in anything where I needed Facebook to stay up to date with info/events. I wonder how much of FB's total membership might be people who felt they pretty much had to join, rather than particularly wanting to (though I guess maybe after that, some of them get drawn into using Facebook for other things, too).
It's a critical mass thing, I suppose… the more people use a platform, the more other people will be likely to join, and once a certain percentage of people are using a particular platform it might become the go-to or even sole method of remote communication for particular RL groups, at least for some aspects. So basically, everyone almost has to sign up, if they want to be involved in groups or activities whose members use FB to communicate.
I find it frustrating, because there are alternatives to signing up for all the restrictions and drawbacks of a proprietary platform, and have been for a long time — you can set up a website, or run a mailing list, or in some circumstances use an actual physical noticeboard, or any of the other ways people might keep in touch and stay up to date without Facebook. But once enough people are signed up, the convenience of Facebook means that those other methods wither away, and if you're the awkward one who's not on FB, you can hardly expect people to remember to phone or email, or pin things to a board, just for you.
It's also frustrating to me that so much online discussion has moved to FB — there are one or two specialist forums I can think of off the top of my head which in recent years have become online ghost towns or just disappeared altogether, because everyone's decamped to Facebook groups. I get it — the infrastructure is all there, it's free, you don't have to administer a whole forum, everyone's already got a login, and so on. But it means you're providing data and ad revenue to an enormous tech company which can arbitrarily control or remove anything it wants. And you lose the benefits of anonymity, too. Anonymity does have its drawbacks, especially with things like antisocial behaviour and accountability, but it also has benefits. People can feel freer to speak their mind than they would if their words were linked to their real name (and probably a picture of them, too). And there's also something different about interacting with people through text alone and under their chosen usernames, without people's personal characteristics (age, sex, race, nationality, accent, disability) necessarily being evident, for the most part, unless they choose to share them. (Though some things may still come through in text, like language differences, cognitive differences, literacy, cultural differences etc.)
Anyway, yeah, I had to get rid of the distraction so I could study, but needed to stay on FB to stay informed about real-life stuff, so I unfollowed all my friends for the duration. After that, my feed was so incredibly dull (ads, "boomer humour" type cartoons, clickbaity neverending reels, ancient Calvin and Hobbes strips, etc. etc.) that I wasn't remotely tempted to waste hours scrolling and scrolling 
Edit: after I graduated, I re-followed the few people whose updates I was actually interested in, but none of them seem to ever post anything anyway… maybe we've all quiet-quit FB?