Do you mind if I ask where you're located? These sort of skills are definitely in demand in plenty of early stage startups that have a toehold, but not a solid position, in a business environment. I'm shooting from the hip based on other responses you've mentioned so far, but it sounds like you've never really had a "real job", where you're putting your skills to work for someone else. Would it be so crazy to suggest you try working for someone else's startup before going off all on your own? That takes a lot of the pressure off of you to have all of the big ideas, but still allows you to work on plenty of interesting problems and see how a business is built.

It sounds to me like you've got plenty of technical experience and might need a little more of the business side of things - how to show the things you've built are valuable. I'm in Cambridge, MA, and I can say with certainty that there are plenty of software shops around here that would claw over each other to get to someone with your skillset.

I'm the least experienced entrepreneur on this website, but if it's help of that sort you need, you've definitely come to the right place.