Either all the cookie recipes are wrong or there's operator error.
Try baking for less time, and check your oven temperature.
Arwa, more brown sugar and less white normally yields a chewier cookie. Alton Brown on the Food Network did an episode on chocolate chip cookies and I think made 5 different cookies, all with different textures. That being said, pm me if you'd like a great recipe.
1. Use melted butter
2. Make your cookies larger...I like the 1/4 c cookie scoop.
3. Take your cookies out a minute or two early when they are just the slightest undercooked.
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