School
After announcing that you wanted to quit after the first meeting, the president of the club has started to hold a slight grudge against you. It didn't help that you joined another club afterwards. One day in math class, the president smugly demolishes you in the math speed game that the whole class had to participate in and embarrasses you. To make things worse, he comments that in his math club, they learn useful math tricks that help in class. You live with constant teasing from your other classmates that you got "owned" by someone you betrayed. It's only a club, how is it even betrayal?