Hey Mark,
You sound like I was when I first started calling. I would go out and not have any luck at all. If you can learn to make that call quiver when you blow it, and if you pay serious attention to your cammies and your scent, you will start having luck nearly all the time. I had one real good hunter tell me that he thinks that maybe 50% of the time, you won't get anything. It may just be because the dogs aren't interested right then. But it will pay you in the long run too, to buy a tape of the sound you want to make and just listen to it--for example a wounded cottontail or whatever. That is, if you are not using an electric caller. I use mouth blown calls 100% and I have real good luck here, but I tell you, I really think camouflage and scent control help a lot. I call nearly always during the day, with the sun and the wind at my back--those dogs come in downwind nearly all the time--and by using scent control methods, they don't smell me until it is too late. Most of my shots are within 50 yards--I have been shooting 'em with an open sight 30-30 until just recently when I got me a 22-250. If you aren't having luck in one general area, try a different one a few miles or more away, sometimes that helps. I also have much better luck when I hunt alone.
Good luck and keep trying!