You must stick and strictly follow what you already plan while trading
Do you know the difference between a pro and an amateur?
And the difference between professionals and amateurs in any game [emphasis mine] is that the professional knows when to stop (these are not my words, so no plagiarism intended). So it is definitely not like "you must stick and strictly follow what you already planned". If something goes against your plans, you should always be ready and willing to fold. If you are trying to push through, no matter what, you may end up losing much more than if you abandoned your plan immediately, without second thoughts or regrets (read, no sunk cost fallacies are allowed in trading)
When plan is likely to fail then there would always be a plan B.If you dont have it then better quit and not to proceed at all.I agree on what you have said on here on which this is a common reason why traders
do really lost up their capital because they do force out things to happen according to their likes even the current condition they are taking is totally going opposite.Soon they do realize when its already too late.
All plans wont be executed or would happen according on what you anticipated and with this kind of market we are dealing with then its no surprise for these kind of circumstances.