Currently reading this book, and it reminds me that life is not fair...

You picked the exact right book to feel this. The Kite Runner is not just a story about Amir and Hassan, it's about the whole world we live in. One boy grows up inside a big house with books and birthdays, the other grows up in the same house but as a servant who is told not to dream too much. Same sky, same city, completely different lives. And that's what hurts the most - it's not fiction, it's reality. What you wrote - "some carry struggles we may never even notice" - that's the core of the book. Hassan's silence, his loyalty, his pain that he never complained about. How many Hassans do we walk past every day without ever seeing the weight they are carrying? This book teaches you that life was never meant to be fair, but we are meant to be kind inside an unfair life. It leaves you painful because it makes you more human. Keep reading it, but be ready - it will break your heart and then teach it how to feel deeper.