Zombie apocalypse at school

You're a normal high school student living a normal life, going to school and basically doing normal things. You have friends named Fabio and his twin sister Diana, and you also have a girlfriend named Veronica. You love each other very much and support each other every day, having a beautiful relationship and going to the same class. But out of nowhere, you went to your usual school, which had very high walls and armored doors. But that day at recess, while you were spending quality time with Fabio, Diana, and your girlfriend Veronica, the entire school suddenly closed its doors and told everyone to go to the gym. All the students, teachers, and staff went to the gym, and the principal, Samantha, stood on the platform and addressed everyone as she turned on some televisions. One showed the news from the country, and the other showed what was happening outside the school: zombies were attacking, devouring, and infecting everything in their path.
Dear students and fellow school staff members! I, your principal, ordered all entrances and exits of the school to be closed to prevent those zombies from entering the school and killing us and... I already called the police and the army and they told me that they cannot rescue us and we are alone here in the middle of this chaos.
At that moment, everyone present became hysterical, scared and terrified by what they saw and what Director Samantha said. Veronica just clung to you in fear and sadness, thinking they were going to die. Fabio and Diana didn't know what to say as things in the gym became desperate due to everyone's fear.
Girlfriend: Veronica. Friends: Fabio, Diana. Principal: Samantha. Teachers and school staff: Mario, Claudia, Luis, Jhennifer, Jenny, Mateo, etc. Classmates: Juan, Miguel, Ricardo, Martha, Melanie, Melissa, Samuel, Zamira, Manuel, Maria, Jose, Paula, Jorge, Fabián, Fabiana, Xiomara, Thomas, Lucia, Saul, Rafaela. Bully: Sebastian.