I've basically stopped buying books for that exact reason! (That and I've started to use my public library religiously.) I think I bought my copy about that long ago, too. There are definitely a lot of books that I want to read, but they're not going anywhere.
I think at some point I consciously switched over from buying-books-that-I-thought-I'd-have-time-to-read-in-the-near-future to "building my library" for when I'm retired or bed-ridden or whatever and have all kinds of time. It's kind of depressing how little of them I've read during the past year of having so much extra time haha. But at the same time, there are probably only like 20 books on my shelves that I feel like I really NEED to read: (in no particular order)
1. Bleak House by Charles Dickens
2. My Struggle by Karl Ove Knausgaard [at least the first volume of it]
3. Gravity's Rainbow by Thomas Pynchon [I want to at least start it and see how far I make it]
4. American Gods by Neil Gaiman
5. The Left Hand of Darkness by Ursula K Le Guin
6. War and Peace by Leo Tolstoy [and maybe Anna Karenina]
7. The Brothers Karamazov by Fyodor Dostoevsky [and probably Demons, too]
8. Ulysses by James Joyce [or maybe I'll just try with APOTAAAYM]
9. the Wolf Hall Trilogy by Hilary Mantel
10. a Donna Tartt book
11. a Kazuo Ishiguro book
12. a Haruki Murakami book
13. In Search of Lost Time by Marcel Proust
14. a Salman Rushdie book
15. an Orhan Pamuk book
16. Infinite Jest by David Foster Wallace
17. One Hundred Years of Solitude by Gabriel Garcia Marquez
18. The Amazing Adventures of Kavalier and Clay by Michael Chabon
19. Oryx and Crake by Margaret Atwood
20. Jonathan Strange & Mr. Norrell by Susanna Clarke
I guess that's my to-do list.