I think my worst mistake is try to become a day trader. I have many winning trading, but for 1-2 fail trade with over leverage, all my funds gone. It's really hard to comeback from that mistake and i have been stressful many days. 
This is understandable as day trading is the hardest way to make money in the markets especially if you are using leverage and the market turns against you, I just hope that you have learned your lesson, if just one or two trades are enough to wipe out your capital then the risk that you were taking was too high, in my opinion if your capital cannot resist 20 losses in a row there is no point in becoming a trader as sooner or later you will lose all your money.