Just launch. Go along with what happens and if you fail, well, you've learned something, right? Also, keep in mind that it took many, many startups weeks, months, or even years to gain traction. AirBnb had been active for years and was just about to shut its doors when it suddenly exploded with activity and popularity. Facebook wasn't the social networking giant it was years ago when it was just a school social network (only had students on it). Stay positive and don't overstress yourself like I did.