I have listed a few things that all traders have gone through and learned from.
"First you lost, next you learn not to lose, then you make money!"
1. Using small stops will definitely stop you out most of the time. You need to understand the volatility of the instrument you are trading.
2. Trading on a feeling of "it just feels right" is a sure way to lose. You have not defined your risk parameters and exit points. Might as well hit the casinos.
3. Overtrading and lacking discpline. If youre in it for the action seek help before you start trading.
4. Risking more than your trading capital. For the eminis, I will trade 1 contract per $10,000. Some brokers will let you trade 10-20 contracts per 10K.... not recommended.
5. Not understanding the bigger picture. Price would be in a downtrend ina 3min timeframe but an uptrend in a 60 timeframe.
6. Psychological makeup. You must be prepared to enter trading. Most new traders take it too lightly and do not understand the amount of hard work it takes to trade successfully.
I know there are alot more. So please feel free to elaborate!