One of the basic problems for traders everywhere is the notion that any time that you lose money, you must have made a mistake. If you make a trade that should be profitable 90% of the time, then it must be true that the same trade will be unprofitable 10% of the time. Yet, when one of those occasional losses occurs, the trader is sure that he/she did something wrong.
We trade in a statistical world. The odds-on favorite wins most of the time. But not every time. Thus, if you cannot discover a true mistake — if you cannot find something that the evidence told you not to do but you did it anyway — then the chances are good that you were unlucky this time, and that you made no mistakes.
Here is a bit of my trade philosophy that I believe would benefit any trader who adopts it: