Ended up returning Rain back to the library without finishing it. I didn't even read a single page because I just didn't feel like reading it. I checked out The Goldfinch by Donna Tartt. Amused me a little to see that the library had 5 or 6 copies of it.
I found a used bookstore in my town that buys books but from Yelp! reviews I see that the staff there is rude and they give you barely anything. So I guess I'm going to donate my 51 books to the library after all. If I can convince my mom that selling them to the bookstore would be a waste of time, that is (I made the mistake of telling her about that idea, now she keeps mentioning it [I also probably shouldn't have told her I haven't read most of the books I'm donating, oops]).