Houston....we have a problem.....
And that being that you are a minor. That means it is ILLEGAL in ALL of the US to sell you any live ammo.
Now, I have GIVEN cartridges to local folks (with the approval of their parents) and even shipped some to a gent (remote area, Idaho) that was helping his grandson, a budding collector. But ammo cannot be sent by US Mail, so shipping costs DO tend to spiral.
I know you don't want to hear this, but without the active involvement of your folks, you are going to have to wait. sorry-
What we have here is... failure- to communicate.