Just really really believe in what you're trying to do. Don't let people alter that. Let people advise you and lead you down paths to make smart business decisions. But trust your instinct and trust that overwhelming drive that made you put all your dreams and everything on the line.
I've discovered that I've never had much respect for money and that has meant that money has ended up ruling me a little bit more than it should have. So I'm trying to learn - at this late stage in life! - to actually control that.