While there will always be the silver spoon fed types who really "know" people, you can go a long way networking and being social. Not social networking. Get off your machine and go to events, conferences, where-ever the action is and make friends with people who can help you, and presumably who you can help too.
I know it is really hard to shift focus from the product and socialize, especially as a single founder. You have grown so accustomed to the efficiency of the Internet that any offline PR or networking seems like a grand old waste of time. I am guilty of that too. But I realize that many entrepreneurs have a competitive advantage by virtue of their social connections. Whether it be in the form of an introduction to a venture capitalist at a party or lunch with a tech journalist.
So I suggest you don't throw in the towel just yet. You now have a product. And obviously a supportive wife after four years. Drop the code for awhile. Step back and reassess where you are focusing your energy to steer your company towards a brighter future. It is not an easy or short road to follow. But if you really want it, you will get there.