As a trader – or an investor – you will not be right all of the time. If you can accept your imperfection, and work within it, you will be much more successful:
If you have a perfectionist mentality when trading, you are setting yourself up for failure, because it is a “given” that you will experience losses along the way. You must begin to think of trading as a game of probability. Your losses ( that you hope will return to breakeven) will kill you. If you cannot take a loss when it is small ( because of the need to be perfect), then you will watch that small loss grow into a larger loss and so on into a vicious cycle of more and more pain for the perfectionist. Trading on hope does not work. The markets can remain irrational for a lot longer than you can remain solvent.
The object should be excellence in trading, not perfection. Moreover, it is essential to strive for excellence over a sustained period, as opposed to judging that each trade must be excellent. This is a marathon…not a sprint.
The greatest traders know how to take cut losses and let winning positions run. Perfectionists often do exactly the opposite. They get in at the wrong time, stay in too long and then get out the wrong time. Perfectionists are always striving and never arriving. The market will find the flaw in a perfectionistic trader and exploit it day after day.
Perfectionists are often motivated by avoidance: the need to avoid unpleasant emotional experiences. Traders who seek the perfect system are also likely to be motivated by the need to avoid unpleasant experiences. 
It is common for traders to complain of a lack of confidence in their trading, but very often it is overconfidence that does them in. Overconfidence results from a lack of appreciation of the complexity of markets and an underestimation of the challenges of trading them successfully. In a sense, overconfident traders lack respect for the markets. They think that reading about a few setups or buying the newest software will prepare them to make money. Overconfident traders don’t want to work their way up the trading ladder: they resist the idea that screen time is the best teacher. They also chafe at the idea of growing their account. Rather than start with one contract and wait until they’re profitable before trading larger size, they want big positions—and profits—right away. Because they’re so eager to make money—and so sure they can make it—overconfident traders generally trade impulsively. They won’t wait for the setup to form; they’ll jump the gun—and get whipsawed in the process. Instead of being patient and waiting for short-term patterns to align with longer-term patterns, they will take every trade, enriching their brokers in the process.