Hmm, OP what do you mean by professionals, every trader loses money every pro or beginner trader makes some mistakes that cause the loss in trade also, pros dont control the market, according to the market momentum their speculations can be wrong but they control their trade by following their execution plan and skills such as risk management, trade management.
You can stop losing money haha by following those professionals' signals and joining their maximum groups, that is just a joke you can it teasing never-mind.