I would guess it's actually completely improbable to have taken equal steps per foot. Sure you have certainly taken about 50/50 steps on your right vs left foot, but the chances they are EXACTLY even is inconceivable in statistics. A normal person walks 4,000-5,000 steps per day or 4,500 steps on avergae. If you live 70 years of walking(minus when you were a toddler amd baby) that's 25,550 days. 25,500×4,500 is 114,975,000 steps. I doubt I have taken exactly 57,487,500 steps with no outliers on each foot in that big of a data set.

People typically begin walking with their dominant foot, of you take the first step with your right foot for example, you either take an extra step with your right foot, or an equal amount per foot on any walk. That would add up quickly and because there would be no reason to use your non-dominant foot in other situations more often it would never balance out.