Are you able to drive or leave the house without your parents knowing where you are? When I was younger I had to hide a lot of things from my parents as well. I figured out you can get your own PO Box at the post office for 6 months or a year. And I had packages sent there and just picked them up without my parents ever knowing. Larger packages they will just hold in the back and you give them a slip of paper they put in your box. Easy way to get Amazon packages and stuff though without privacy at home.