I live a happy and fulfilled life with never having been on Facebook. I get invitations to parties and things the normal way: text messages, email invitations or mailed invitations (the latter being rarer). I volunteer at the local school and at my church. I talk in real life to my neighbors. I catch up with friends over coffee or lunch when we can. People who are too far away, we communicate via email (some of these via group email if there's a bunch of us in a convo). Events and things in my area are usually covered well by the local papers etc (even though I do not get the local paper, I can look up the online version of the paper to keep up to date with what's going on). I don't for a minute feel cut off from how the world works - if anything, I feel connected with the people in my local community and to friends and family further afield.
You are the statistical outlier and are lucky enough to live in a dense, populated area that you have access to those things, and having a church to volunteer at is already a community that expects you to embed yourself into. Given how fewer people are belonging to something like a church, that is not a common thing.
These posts no longer accurately reflect my views toward Facebook.