Looking for multiple books w the following vibes

Sorry I need a lot of help with finding books I just recently really got into reading so you know of any books that’s fit these categories then please let me know

• Something that just makes you feel empty while you read
• A book with the vibes of 500 days of summer
• A book with the vibes of when Harry met sally
• books kind of like Diary of an oxygen thief where you get an inside look of the characters mind
• sad books but not romance sad just sad because of life

I don’t really enjoy too much romance I like books/movies that make me think or give me a new look on life