You have a similar problem to what I have. After you graduate from college (or if you never go), it is waaaay harder to come across 'dateable' singles unless you have a very socially active group of friends as your main hangout partners.... especially if you're not a bar/club-hopper.

Networking is the way to go. It takes a lot of effort and it doens't always pay off. Try to chat up friends-of-friends and/or acquaintances to broaden the circle of people that you are exposed to. Try joining an adult coed sports team/league to try to meet new folks that way.

Let me know if any of that stuff works so that you can give me advice... cuz whatever i'm doing ain't workin! :-)