your main fear is losing your money. To avoid this kind of fear, you need to invest the amount that you do not mind losing.
Thats right, dont invest more than you cant afford to lose, this strategy is simple but works. not only because you are fear of losing then you are afraid to take certain steps and decisions. therefore adjust capital to your financial ability so that you are not afraid of the risks there and your calculations can be made carefully..
It is one of the most basic lessons about trading and yet people always get that lesson wrong, it seems they think they are above the most basic principles of trading not understanding that are precisely those principles the ones that are going to save you when you make a mistake, I say this because I have seeing it, I knew of a few people that lost almost all their money in a single trade and they refused to sell because the price was too low and they kept holding their coins until its value was zero.