"......If there is one thing consistent in the stories of how good traders turned themselves around from being bad traders, it is their attitude about losses. Professional traders accept that losses are part of the game. Since the markets are mostly random, the best trading methods will always have numerous losses. Professionals do not equate losses with being wrong.
It is precisely because correct trading methods invariably generate many losses that it is important to keep the individual losses small in relation to the overall size of the account. In order to keep trading, you must preserve your capital. IF YOU CAN KEEP TRADING IN THE DIRECTION OF THE TREND, THE BIG PROFITS WILL COME. However, if you take too many large losses, your capital will be wiped out before you can enjoy the big profitable trades.
The laws of probability INSURE that regardless of your approach, you will inevitably suffer some long strings of consecutive losses. If you are risking too high a percentage of your account on each trade, before long one of these unavoidable losing streaks will blow you away. Keeping losses to about one percent of your account size is optimal. With smaller accounts, the percentage will have to be larger. Five percent on one trade is probably the highest prudent level of risk." - Bruce Babcock
If you are struggling, you probably need to make these words your daily mantra...