TBR Why?

I always start off good with a to be read list, but at some point, everything gets turned around and jumbled I've read this year that hasn't been on any of my TBR lists and I've somehow switched TBR books in TBR and it a mess, but I keep doing this Why? because I have hundreds of books to choose from and it gets overwhelming for me to go in to my library and look at all the book read and unread and it easier to deal with that once or twice when choosing a selection of books to read for the year and pulling them away from and looked at as a smaller amount of books