It may sound harsh, but the answer is really simple - don't bother with negative people!
From time to time, there will be someone to tell you that you are wasting you time with SFI, that you can't earn money here etc. Only waste of time is if you start arguing with such people and try to convince them to start working here. And while you waste your time, thousands of people willing to give SFI a try are waiting out there, and you can give them this opportunity.
Keep your head high and don't let negative people bring you down. Simply say "Thanks" to them and move on.
It may sound harsh, but the answer is really simple - don't bother with negative people!
From time to time, there will be someone to tell you that you are wasting you time with SFI, that you can't earn money here etc. Only waste of time is if you start arguing with such people and try to convince them to start working here. And while you waste your time, thousands of people willing to give SFI a try are waiting out there, and you can give them this opportunity.