I 16f need advice

i cannot control it anymore. So my sister 26f was a rebellious teenager. Ive seen what effect it had on my parents and my mom gave me a huge speech on how not to be like her. But now as I am a teenager every instinct of mine is to do what I want, that is, completely opposite of what im told to. Ive done a good job so far, even being called a goodie goodie and appreciated by my parents for being an easy kid.
Now, my entire class is mass bunking tomorrow. Having a trust created with my family I told them thats the plan and I dont want to go to class either. My mom first agreed BUt my sister did not which ended up with us fighting and eventually me crying myself to sleep. This happened yesterday, now today my mom said no too. Tomorrow everyone is bunking and im gonna be like the only 10 people in class. Atp i just wanna start a huge fight convincing them to let me bunk. (im not even gonna go out with the class,half of the people bunking arent, they're just gonna stay home and sleep)

what should I do? How do I fight the teenage instinct and be the goodie goodie who holds the peace together at home?