One of the biggest stock trading mistake while trading in stock market or as a matter of fact in Forex or Commodity market is that one gets into apologetic mode even having realised profit because that stock after booking profit has gone up by another 500%.
So keep this thumb rule that one should never apologize for a profit. You must analyse that your main goal is to make money in stock market and even if you make 10% and stock goes up another 500%, you should not regret as their is no use crying on the split milk. Just remember that You have made money and that's a good thing as each profitable trade increases your self confidence and your body starts getting in sync with your trades. You must also check out Biggest Stock market Mistakes to avoid losing money in market.