"Fangirl" is a young adult novel written by Rainbow Rowell that follows the story of Cath, a college freshman who is an avid fan of a fictional book series similar to Harry Potter. As she navigates her new life at university, she struggles with social anxiety and the challenges of growing up while balancing her passion for writing fan fiction. The novel explores themes of identity, family relationships, and the impact of fandom on personal growth. Cath's journey highlights the importance of finding one's voice and the complexities of transitioning from adolescence to adulthood in a world filled with expectations and pressures.