Who is the protangnist and antagonist of book perfect?

The protagonist of "Perfect" by Stephanie Perkins is Cecilia "CeCe" Rodriguez. She is a strong and determined young woman who is trying to navigate the challenges of love, friendship, and her own self-discovery.

The antagonist of the story is a bit more nuanced and could be argued to be CeCe's own insecurities and self-doubt. While there are external conflicts in the book, like CeCe's complicated relationship with her boyfriend, Owen, the primary obstacle CeCe faces is her own perception of herself and her fear of being "good enough". She struggles with the idea of perfection and its pressure, ultimately learning to embrace her flaws and imperfections.

Therefore, the true antagonist in "Perfect" is internalized and represents the societal pressures and self-imposed expectations that many young women face.