Book recommendation?

So, I want to start reading again because it's been a while since my last book and i can feel my brain rusting from the disuse. I would love if someone could recommend me some books to read, i'm particularly interested in books about loneliness and/or depression since i want to read a story i can relate to (lol). The shorter the better (uni is starting soon and won't have much time to read).

Thank you!