To become a successful forex trader means you are discipline to trade the market with knowledge and experience, without fear and be consistent in making profits. A successful trader never mind losing money in forex because he knows the market is the master.So, a beginner will take that loss as negative, while a professional and successful trader will take that as an advice, better be sure before trading the pair, see if it is not ranging. Learn from the mistake and carry on to the next trade while forgetting this loss.