Suggest me a book about being lost in your 20’s that’s serious and focuses on interpersonal relationships, self discovery.

Hi, I’ve been wanting a book that focuses on these types of themes! I enjoy books that are more serious in tone, focuses on real life experiences, relationships, usually more in the modern era, as in not the 1800’s. I recently read never let me go, I find nothing has lived up to it so far. I’m current reading Eleanor Oliphant is completely fine, while I enjoy it, the main character is just not relatable ( clearly autistic coded and I’m not autistic) and I find the book, although explores some more serious tones, is too comedic for my liking. I’d also prefer a female main character, although I’m not too picky in this regard. Bonus points too if any novels involve a character who’s more adhd/OCD coded. Let me know if you guys know anything!