The hardest thing about starting a company is the fact that you are going to be highly motivated to ignore the problems. Fake it till you make it, move fast, break things, that kind of thinking gives permission to ignore the obvious problems, and it's never worked out well for Buster. He say the problems are eventually going to become unavoidable and they will destroy you. Instead, it is important to understand the simplest path that can take your business to being sustainable.
Start by figuring out why someone would use your product, why would they pay for it, why is it better than alternatives, what would make them switch...etc. Be realistic about your assumptions and expectations. Look for the thing you don't want to see.
p.s. Buster has just finished a book called Why Are We Yelling?. It's a good read!