I’m sorry. Your letter only supports your parents’ decision. You are not being “forced to procrastinate.” You are making an immature choice. You will not be on your phone when you move out as some kind of making up for lost time. That too would be an immature choice. The best thing you can do is show your parents that you are mature by sticking to the reasonable schedule they have laid out for you. Having done that for a while (and having the grades to prove it), you will have a leg to stand on when you make another effort to talk with them.
Yes, you should be given the freedom to make your own mistakes but your folks are trying to give you the foundation you need to make mature choices. I’m with them on this one.
I wish you well