What should I do?📦🤷🏼‍♀️

Okay, so months ago I tried birth control pills and they were not good.😬 I bled healthily and I became erratic with my decisions and emotions. I was looking at eve’s birth control section and learned about the “diaphragm” right?🤔Well, they don’t really make them in the USA anymore so I ordered one online. Issue is, that now I have to be 21 to sign for the package. I’m 18. How on earth is this supposed to work? I was labeled as an “adult item” which sounds really bad. 🤦🏼‍♀️ Do I just go to the post office and sign or what?