Risk on a trade is a common one.You have to learn things from the loss trading.In a gain trading, you can't learn anything. But while thinking on a loss alone, you get the same as a emotional one. It may leads to the sad mood.I had loss over 3500$ in a future trading of two big trade. But I had get into the idea of next trade. Because I had a strong mind to get all my loss to my own wallet. The positive mind is the only source for the next trade after a loss.
By looking to your perspectives, it's true that positive mindset will allow you to cope up with those previous losses, instead of regretting or focusing with your emotions from your last lost, it's better to think positively and try to move forward, learn from your mistake and try not do the same on your next trade, be ready and willing to adjust with every situation that you'll going to encounter along the way.
It's normal to lose, but you can minimize it if you have deeper knowledge of the market that you are into.