The first thing you need to do is take a very deep look at your strategy, which kind of strategy it is? Is it one that is heavily affected by your judgment or is it one that depends entirely on the numbers you see on the screen?
If it is the former then this means that most likely you are letting yourself be affected by the market sentiment and this is causing you to do what it is in the best interests of the whales and not what it is best for you, but if it is the latter then I think as crazy as it may sound that you have your strategy backwards, try to test your strategy and see if it works if you do the opposite and if it does then you have your winning strategy.
That is something I keep telling everyone and yet there are still so many people who let the market movements blur their judgement which is a shame. There are so many people who have ideas, who have goals, who set out prices they want to buy or sell and then when market does something crazy they end up throwing all of that out of window and suddenly make a crazy move. Why are people like that? I mean whats the point of being like that when there are very understandable and reasonable stuff that could potentially allow you to make a profit using only numbers and zero feelings?
In any case if the market movements are making you squirm then you should not become a trader, or at least risk too much money or you should learn how to suppress our feelings and just act like a robot. You know why there are so many trading bots out there? Because trading bots are better traders since they have no emotions.
As you say one possibility is that they simply do not have the necessary emotional control to become traders, after all it may seem as if it is easy as some people see it in a way similar to a video game, but as soon as the consequences for failing become too real then people cannot deal with it anymore.
The second problem is that many people have a strategy but they do not actually know if it works since they did not backtested their strategy, which means that when things get hard they do not really trust their strategy and then they panic and then sell their coins for a bad price.