I don't know how to lose weight in 3 months does this seem like a good plan PLEASE ANSWER THIS?

It's a horrible plan. At 13 you need a basic healthy diet. Focusing on forced weight-loss is medically unsafe. 180 at 5'5" does seem like a lot but if you just adopt healthy habits you probably won't gain much as you finish growing into an adult and may lose a good bit in the meantime.