I too have a lot of books on many bookshelves. A long time back I came across one I had forgotten about and not read. This led to the creation of a bookshelf entirely for unread books. Which led not to FOMO (or guilt), but to stress from not reading all the books accumulating on that shelf. For me, learning is just a byproduct from the pleasure/enjoyment I get from reading a good book. I'm long over the stress part, but still buying, albeit more selectively. And I try to stay away from our annual "Friends of the Library" sale. I'm out of space. I also don't like the term antilibrary. Too much of a negative connotation in my mind.
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