not just books but almost everything. there is a lot of anxiety seeing others put out stuff when you are barely stringing along. dont beat yourself up, focus on beating yourself.
Maybe "use your time well" is a better thought?
Focusing on beating X just makes it a metric, and can be destructive when you'd be better off switching to some completely different activity instead.
When it's a metric, you can be tied to keep meeting it (or even just attempted to) well past it's usefulness.