If you're looking to meet people then avoid activities where people generally keep to themselves. For instance, there are lots of people at the local gym, but most of them don't want to be bothered while they are working out. I suggest:
- Karate/Judo/Tae Kwon Do/etc
- Wine Tasting Club
- Taking cooking classes
- Book Club
- Volunteering for various local programs
- Attending City Council meetings and getting involved in your community, regardless of how small it is
- Get a second job at a place that might not pay too well but is at a place that might be somewhat interesting
First things first, turn off the fucking TV, Shut down the computer, and get outside. Pledge to spend 2 hours a day outside of your home, no matter what you are doing... washing your car, riding a bike, walking, at the library, cutting the grass, reading a book on the front porch, whatever. Commit to it, stick to it, and you'll figure something out soon enough.