Dear Alice,
It is a very common problem for us who are at the age of teenagers, so this is not a big problem and you must calm down; we can deal with it as a piece of cake.
First of all, we must do such a important thing that making communication with your parents. During the dialog, you must become to a responsible person in your words, and declare that you have become to adult person which can deal with many things by yourself. Finally, you can show your behaviors to proof that you are exactly right.
Just do it!
Yours,
Han Mei.