Disaster happened in basketball team

I wondered why our basketball team was lead by Sean. What happened to my originally and peaceful basketball tea? Were there any events happened on Monday which I was not there. I felt extremely upset because I thought we can decide to do whatever we want. Sean is getting rude to me with disrespect. However, I tried to avoid any damages either in future or right now. By the way I realized that batteries  have more energy than old batteries. At first I thought the maximum of my laptop's energy was one hour and thirty minutes. After I changed my battery, I can have over two hours of energy. It really, really shocked me. I had a quiz today in ESL American Culture. I thought it would be more complicated than i thought. However, I was not sure about answers I wrote. I usually don't believe my answers, but in this case I believed. It would be shameful if I got worse than other ESL students.