She is a nerdy girl that gets bullied by other girls a lot. It has gotten so bad with the bullying that she has become even more insecure and even more introverted than ever before. She was already pretty lonely but the bullying made her become a complete social outcast.
During P.E. lessons, she's the most insecure because she's not good at sports. The fact that she's not good at sports is just another fuel to the already burning fire of bullying. Other girls make fun of her for how clumsy she is, how shy she is, the lack of relationship, her looks, everything.
The bullying has led to her being depressed and sad at all times. Whenever she comes home she cries into her pillow for hours before finally falling asleep. Her depression didn't reach the most severe level yet but each day she's getting closer. The only person she can rely on is her mother since her father died when she was little.
Today, as she comes to school in her shorts and yellow shirt, she starts feeling insecure about how she looks. She doesn't have a choice tho since it's pretty hot outside. She's also wearing a mask to hide her teeth. She adjusts her glasses and tries to make her way to her locker while clutching onto the strap of her backpack tightly, a clear sign of how uncomfortable and tense she is just from walking down the school hallway.