This "tell them you are gonna do it anyway .." is a bunch of crap.
Bottom line: It's their home, you live under their roof, its their rules. Period.
If you move out, pay your own rent, pay for you own food, make your own way, then you can decide to do what you want.
Of course, yeah, you could accpet that argument and say that you are gonna receive it outside the house, get your shots outside the house, etc.
But still having it delivered to the house, accepting it there, stroing it there - where its THEIR HOUSE, is wrong.
Imagine having your Mom get subjected to the horror of cops showing up 2 mintes after the package was delivered, being subjected to a search, the embarassment to the whole family as 3 cop cars sit parked outside your home, lights on, for like 90 minutes ..... all your neighbors watching this .... maybe you have brothers or sisters who would then getharassed about this at school .... "what happened to their brother" - was he a dealer - what did he deal?
See what risks your subjected your whole family too?
If you were bent on doing roids at all, involving your family, and their HOME, to any of this was wrong.
Doing roids at your age is not smart anyway, but thats a whole other conversation.
I would apologize sincerely to your parents. Tell them about your decision to get educated on this subject and your decision. BUT DONT DO THAT AS AN EXCUSE OR JUSTIFICATION. Simply say you went through this education and decision process, and during that you forgot the fact that you may be subjecting the family to risks by having it sent to the home and being stored there. Sincerly apologize for that and let it go.
One cycle is one cycle. Gains are gains, you can always get them later (and you would be better of in 2-3 years anyway). Cycle and gains may come and go.
Your Family is forever.