Book where the MC suffers mentally throughout, like the movie Come And See

Looking for fiction that is gruesome/disturbing (doesnt have to be gory) where the mc is mentally/psychologically/emotionally tormented throughout the story and eventually left empty and shattered to their core. The head example is Come and See, but other things that came close were Jesse in Breaking Bad, Crime and Punishment, and maybe Ellie in The Last of Us Part 2.