Alan
One must ask if you have set targets to help why do you close before reaching them. Is it something to do with the price action, if so does it repeat itself each time you have felt the need to pull the trigger.
If this is the case then start (if you have not already done so) to keep copies of the charts when you were forced to close early. Look at the action that followed and see if any comparisons can be found for you to look for in the future to help you.
Do the same for all cases where the price has turned against you so that you will have specific signals to look for. If you do not see the same or similar set-up before a target is reached then it may help you to reach your target before pulling the plug.
Of course there could be another problem, are your targets realistic.
Kevin