For me, the first thing I decide is why I'm building something. If it's for me, or to learn, then abandoning it is part of the process. Get out of it what you can and move on.

Regardless, definitely get involved with other people. Join communities like JFDI. Follow authors like Nathan Barry. Form a mastermind group with other entrepreneurs, online or in your community. Email it to me, and I'll give you feedback!