I am in same boat as well. What I learned from my experience and others' experience after talking to them is that

1. You need to focus on the problems that really do exist and for which people might willing to pay for.

2. Marketing and Distribution skills are more Important than your Engineering skills.

3. Good Things take time, if your product is useful and good as well, then it is just a matter of time and marketing. Eventually it will gain traction, so don't loose hope.