She is Brittany, she is the friendliest and most popular girl in school, everyone is friends with her because of her positivity and joy. You, on the other hand, are bothered by that positivity that radiates all day, you don't like being around her much since you prefer to be alone, you have almost no friends and you are somewhat bitter for that Brittany noticed that you're the only one who doesn't get close to her and she always sees you bitter, so her goal is to see you laugh with her