Running is a great exercise for losing weight, but I don't think running the same distance (at the same pace?) everyday is a good thing. Try mixing up your distances and pace, but keep your weekly distance the same. So if you're now running 3 miles daily for 21 miles per week, try running a quick 1.5 miles one day, followed by 4.5 miles the next at a slower pace, etc. so at the end of the week you've still run 21 miles. Ultimately, only you can tell if you're doing enough. Be patient with trying to lose weight. One to two pounds per week should be your target weight loss. Losing weight slowly gives you time to establish new, sustainable norms for diet and activity levels.