My sourdough starter is only 5 days old can I try to use it in my pizza dough?

Is it rising and falling between feedings? If so, it's ready. If not, it will need a few more days. ;o) P.S. If you want the flavor, and the starter smells good to you, you can still use it in your pizza, but add a pinch or two of instant yeast to help the rise.