Yes, you will make mistakes. Yes, you weren’t perfect when you joined and perhaps never will be. But don’t let that become a barrier on your path to success here on Fiverr or anywhere else.
The ones who see you as a threat to their own business will do their best to not miss a chance to make you feel ashamed or show you that you are not worth it. Don’t let any of them tell you that you are no good, because that’s exactly what they want.