If you are not enjoying your book, you are free to close it and never open it again. Even if it’s a classic that everyone loved. A book has one job, it literally only has to be interesting. If it’s not, have no guilt about not finishing it.
having a permanent full time job is you thinking to yourself “so this is really the rest of my life huh” as you come home every single day before using your 4 hours of recreational activity to do nothing and then going to bed