Books you wish you read when you were 20?

I turned 20 two weeks ago and it feels like a very big important milestone. I'm no longer a teenager. I am a big reader and I spent most of my teenage years reading books and going "I wish I'd read this when I was younger, like (insert particular age)."

To avoid this in the future I'd like to hear the books that helped you when you were 20 or in your early 20s, or the books you've read since and wish you'd read at that age, or books you think everyone should read, etc.

I am a huge lover of the classics like the Brontë sisters and Jane Austen, I adore Sylvia Plath, and Lessons In Chemistry and Yellowface are some of my favourite books. My favourite genres are dystopian, historical, romance, but I read a bit of everything.

Thank you in advance!