Loss is the bad thing and noone want it to show up. But the key thing is , if there is exist a winner so it must has a loser with it. So When you're losing , someone else is winning. So learn how to become that winner is the way to deal with loss.
Everyone wants to be the winner so who are the losers? Accept yourself as the loser and you will learn how to win.
In trading not everyday you will predict it right, just keep learning so you will be consistent and be professional in dealing
with your loses and always look at the bright side, when to quit you will not succeed so be strong and focus on your goal to be profitable in trading.