Why does Pony say it ain't fair?

Ponyboy expresses that "it ain't fair" because he feels the weight of social injustice and the struggles faced by his group, the Greasers, compared to the Socs. He grApples with the disparities between their lives, highlighting how circumstances and societal expectations shape their identities and experiences. This sense of unfairness reflects his broader concerns about inequality, violence, and the loss of innocence in their world.