Fear . I think this is the problem most traders encounter. And my self is like that, the time when I first invested I lost a lot because of this. And now I have improved it.
Add the GREED emotions in trading. If we fall for any FOMO,it will destroy our trading plan and strategies. We have to be confident enough and be courageous when entering such trades. If we are able to build knowledge within ourselves, we will be confident enough to do some tradings