Why does Esperanza feel a distinction between herself and Nenny?

Esperanza's sense of distinction from Nenny largely stems from the fact that Nenny is still very much in the realm of childhood, while Esperanza is beginning to grapple with the complexities of growing up. This transitional phase is significant in the novel, as Esperanza navigates her identity, independence, and the expectations of adulthood. The responsibilities, dreams, and dilemmas that come with adolescence create a natural separation between her and her younger sister, who remains uninhibited by these concerns.

This distinction highlights themes present in the novel, showcasing Esperanza's desire to break away from her childhood and the challenges that accompany becoming an adult, including the search for her own identity and her longing to escape the limitations of her environment. Nenny, still lost in childhood wonder and play, serves as a reminder of the innocence that Esperanza must leave behind as she embarks on her journey towards adulthood.