Mimi don't feel bad- I average only about 9.3 or so mph. I think it's partly due to living surrounded by hills. On flats stretches I ride at about 15-20mph, I can do 35mph downhill if conditions are safe, but much of my actual riding TIME is spent crawling up hills at 2-3mph, so that brings my average speed way down.
My "daily" routine ride (whenever weather & my schedule allows) is 21 miles but it takes me about 2 hours 10 minutes to ride it.
The good thing is that we are out there pedaling and getting healthy.