If success would be easy, everybody would be successful, no?
This is true as a rule because life looks like that when you are not trained in business. Without knowing what to expect when you start your business you run the risk of buying these people’s fears of your success. Why? They do not want you to succeed because it will make them look bad:
So the real cure is NOT to buy their baseless opinions provided you did your own research, as if they would truly research the market they would want to get their share BUT they are too lazy to even bother dreaming.
Either they buy your story or you buy theirs, it still boils down to your own decision and since your always train yourself into better decision making, you should win.