For me reading is absolutely not a social activity and I very seldom visit Goodreads (mainly for correct series info when I can't get that elsewhere), or any other book groups and forums. I have no account there. I don't want to discuss books I read with other people, I don't want to read reviews and opinions, and I don't want to see recommendations. And I don't want to have the books I read - much less my opinion of them - visible to all and sundry (perhaps you can keep your books private on GR, I have no idea). It's not that I read hardcore erotica or the like; I read mostly run-of-the-mill genre fiction, nothing to hide there. It's just a preference.
So I do all my book management in Calibre, which I prefer anyway, as it's perfect for my solitary nerdy nature and my love of tinkering.
(And before someone points out that I hang out on MR, which is a site dedicated to reading - yes, I love discussing ereaders and ebooks about the hardware and software aspects. What I'm not interested in is discussing the content of the books).