How do I get hold of the acai berry stuff without my parents finding out?

I have been trying for months to lose weight for months but it hasnt worked. Now my only other option is to use the acai berry stuff or some sort of diet pill. I know it works. But how do i get hold of it without my parents finding out? Im too young to be able to buy it from a shop and if it is posted my parents will kill me!!
I know, i am pretty screwed.

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