Kim, I was the same way. I dropped almost 30 pounds before I could notice a difference in my clothing size. Of course, my old jeans were so tight when I started, it took a while just to get them to fit normally, much less drop a size.

Don't be discouraged. Twenty pounds is a LOT of weight, and you've done wonderfully! If you're not exercising or weight training, I'd encourage you to do so. It really helps shed inches along with pounds.