Trading requires having a solid guidlines and discipline. One of the hardest thing to overcome in trading is emotions because it mostly lead to many losses. This is a bigger problem than trade going against you. An important thing is to only trade with what you can afford to lose, accept that trading is not getting a quick rich scheme. When you deposit money on an exchange, you accept losing it all but also you’ll do your best for it not to happen knowing how much it will take for you to get that money. Fix your risk per trade percentage and don't go all in a trade with your full capital. Do not be pushed to increase your trade stake when you are in profit to maximize it or recover your losses. This is the emotion that you should curb to make it in trading.
Yes you are right, specially for newbies, it's really hard to control our emotions when trading, specially when you see that your portfolio is going down very fast because of the dump, and you think that you are going to lose so you push the sell button right away.
That's why it is really important to learn how to manage and mitigate risk specially in crypto. Having a good entry and exit plan, stop-losses etc. And remember that crypto trading is like a marathon, so you need to be emotionally tough so that you can stay longer in the game.