Why don't you log your commutes? If it's because you go slower, give yourself permission to do so!
I stopped using any site/app long ago, when I started getting upset with myself about my speed, even though I kept it private. What I do now is:1) everything I do on my 2 bikes is in my Garmin. I do not upload it anywhere. Obviously, the bike I use to commute has a slower average, but I also ride this bike on road rides, too.
2) I also keep a training journal that's put out by Bicyling Magazine. I log mileage, average, and route and how I felt. I also log my weight in there daily, and in the spot for cross training, I'll note any boot camp, walking, hikes.
I am glad I had this, because DH recently "accidentally" lost all of my data on my Garmin. I was able to go to my paper log and tell him exactly how many miles I had on each bike, so he could put them in.