You are going to be a librarian? What courses are you taking toward that, and what school are you attending, just out of curiosity? Well, not QUITE -- I am interested in becoming a librarian once I'm done homeschooling my kids, and I wanted to start work on my degree at night school within the next couple of years. So I'm interested. :)
I have the same book addiction, same 3 6-foot shelves overflowing, books from when i was 7 years old... I read mine in 2 hours on the subway each day. Hint: don't buy books you can get at the library! Then buy used ones as cheaply as possible...
Try to keep to a theme. Then, you can quickly scan a book to see if there is something that enhances your theme and make it worth reading.
Take notes on your books, either online or on 3x5 cards, in case you ever need to look at them again... this makes it easier to give them up when you run out of space.
Did you see the New York Times article in the last couple of years that showed people sleeping on books because their apartments were so full of them??
I think the same about library books. There's a quality to them that's different from the ones I own. I imagine and wonder about the people who checked out the book before me; what drew them to that book. If it's a self-help type of book, I wonder what course of events in their lives led them to seek help from this book....that kind of stuff. I go to the library all the time, and often end up checking out more books than I'm able to read at one time. I also want to be a librarian (academic), so I figure that it doesn't hurt to be a frequent and avid library user.