I feel I have a disconnect in my understanding of socializing. People recommend things like "getting out of the house" and "having hobbies" if you want to make new friends, I do both of these things but they don't seem conductive to making new friendships for me in the way others claim they them to be.
As an example, I've been going to a book club for around two years now. Should I have made new friends by now through the book club? How do I turn going to the club into new friendships that exist outside the book club?
So far my experience with hobbies is that you interact with people at the hobby event in ways related to the hobby and then once the hobby is over no one interacts with each other and everyone goes home.
This has been consistent in every hobby group I've been a part of, multiple book clubs, hiking clubs, gaming clubs, programming clubs.
What am I doing wrong here or is this just normal and the online advice is overstating how often just being outside and socializing turns into friendships?