The worst thing I ever did was sell my bitcoin at a very cheap price I had a huge loss. My mental and emotional level is an important part of taking every decision.
It's true - the ability to take emotion out of trading is paramount to being a successful trader. It's definitely easier said than done, though. Hell, even hodling can be hard when the market dives!
It is natural. Definitely if you have invested in bitcoins and there you are seeing the prices are cautiously decreasing for no reason. Your mind will absolutely be shaken and there will be ring bells in your mind for taking out your investment. Then this would be the best moment of decision for a trader whether to listen to your heart and become loser or listen to your mind and control over everything.