You made the cardinal mistake of investing: you bought high, and sold low. Many rookie investors make this mistake because they are unable to control their emotions when the value of their investment takes a downturn. It can be nerve-wrecking to imagine all your money evaporating.

Fortunately, your mistake cost you only $800. So it was actually a good learning experience. From now on, buy low and sell high. For example, the best time to buy is when a (recoverable) disaster or sensationalized story cause a financially strong company's stock price to dip. That's the perfect opportunity to buy some of that stock.