I think emotion is really a hindrance when it comes to trading. Actually you gain a lot more than you lose. Gaining a lot of knowledge is much compare to losing a part of your invest. If you didn't learn anything at all then perhaps you are not serious in trading.
Emotions and greed are the two main enemies of successful trading. When I was a beginner, I also made mistakes. But then I realized that it is better to trade less risky, but it is guaranteed to have 1-5% per day