Alienated young people

Hello! I’m looking for recommendations about misunderstood young people (teenagers or in their 20s (adolescents)).
I'm new to reading, and so far my favorite authors are Dostoevsky and Sylvia Plath.

Honestly, I would appreciate any recommendation involving young, lonely people. I love introspection and the feeling of seeing a character raw, from inside. I don’t need the protagonist to be completely alone, or the book just being they reflecting, but I want a level of introspection.

I don't care if it's long or short, classic or not, and I enjoy a lot of main topics. I do not love science fiction or fantasy, but if you know a really good book that’s Sci Fi then I’ll take it.

(English is not my first language so if I made horrible mistakes that’s the reason).

Thank you.