Simon Vs. The Homo Sapiens Agenda by Becky Albertalli
The book centers around a high school junior named Simon who is not openly gay and prefers to save his drama for the school musical. However, when an email falls into the wrong hands, his secret is at risk of being thrust into the spotlight. Now, Simon is being blackmailed, and he must step out of his comfort zone before he's outed against his will or worse, the privacy of Blue, the pen name of the boy he's been emailing, will be compromised. As he navigates through friendship, blackmail, and the prospect of love, Simon must find a way to be true to himself while also trying to decode the identity of the anonymous classmate he has fallen for online.