Believe in yourself
I met an old friend recently who really discouraged me when I told him I was doing internet marketing. He tried to make it appear like I was in a very competitive industry and it was going to be difficult for me to make money.
Anyway I told him I wouldn't be doing it if I didn't believe in it and that is all that matters. I have been involved in other sorts of businesses in the past. Affiliate marketing to me is the real deal. Its not hard to see the potential within.
Sometimes you just have to believe in yourself, especially at those times when others wont believe in you.