There are many things I love about working in libraries: finding answers to tricky questions, helping others find what they need even if they don't know what that is, and much more. I've also met a great many awesome people while working in libraries, as well as made some close, trusted friends, and hell, even found my wife.
But the thing is, right now, I'm pretty sure I'll never be completely satisfied long-term working in libraries. I've slowly discovered that I need a career that is constantly challenging me intellectually or at least keeping me on my toes. That doesn't happen often enough in the field I am now (or at least not in the way I need) and I don't expect it would change much even if I stick with it.
I don't yet know where I'll look to next, as I have some soul-searching to do first, but there are plenty of possibilities. And that thought alone gives me the courage to start anew.