How can fb ppc + shopify be profitable? Am I missing something?

Hi,

First, I am a newbie in fb ppc, spent only $11 till now in fb ads and haven't got my first conversion yet. I really want to start getting positive roi so I can finally make some money. Ok, so, I know just by having products and showing it to people won't get sales, there has to be psychology and thoughts behind these marketing techniques for it to work, and I am at a disadvantage because I don't live in U.S but I target U.S and therefore I don't know much about mentality of U.S people…

How can fb ppc + shopify be profitable? Am I missing something?