I know the risks I take in trading and I know that my money in trading is not free. I'm a form of trader who doesn't put all the eggs in a basket so I'm good at managing the risk. Loss is inevitable, which means that even professional traders suffer losses. I sometimes experience losses, but because of my risk management, it's only low as I don't go all in when I do business.
The point is to always use money that is ready to be lost, with controls like that at least we will reduce losses in large amounts. So in this case self-control which includes emotions and greed will be important if you don't want to lose. Indeed, loss is unavoidable but at least we can manage losses to a minimum that we can.