Hello LePotato!
Welcome to Bitcointalk and the world of Bitcoin!
Regarding your question: I would not recommend to invest in cloud mining with such low investment capital. Today, it is not worth anymore for normal people to mine or cloud-mine Bitcoins. The Bitcoin price is so high that a lot of financially sound investors are in the business. I would buy Bitcoin directly with your $20. This make more sense!
But I do not want to stop you from your decision. It is always good to make experience in order to learn. But I predict that you will get less Bitcoin out of your mining-investment compared to a direct Bitcoin buy.