Is it normal to be obsessed with a book?
Yep.Totally normal
Yes—it’s normal to get completely absorbed in a book. Thinking about it a lot, rereading favorite parts, or wanting to talk about it is usually just enthusiasm doing its thing.
A book can really grab you: the characters feel vivid, the story gives you something to look forward to, and your brain keeps turning it over even after you put it down. Plenty of people get intensely attached to a book or fictional world for a while.