I have made some loss in trading in the past but it never made me disappointed as it was a learning experience for me and if I would get disappointed then I would stop investing my money in trading and profits and loss will always be a common practice in bitcoins.
yes that is not good to disappoint in trading, because loss and profit are the part of trading, some time we lose money while other time we make good profit, if you are losing money continuously then you should change your strategy and planing about trading but i think still you do not need to become disappoint, because disappointment can ruin your whole life.