I used to be hesitant to run outside in the cold. In fact, my first winter back in Utah I pretty much didn't run outside. I commuted to a gym and ran on a treadmill for most of the miles put in. The next winter I decided that I was going to confront my fear and actually run outside. I got some tights and put on a fleece pullover and before I knew it I was able to run outside in 20 degree weather without any problems. However, this first winter outside I limited myself to just running on a main road with plenty of lights. I didn't deviate much from the same path to get in the miles.
The next winter I overcame even more of my fears and ran on the backcountry roads that are very dark. It turns out I love it. I liked running where it's incredibly quite and the only thing out there is me leaving tracks on a half inch of freshly fallen snow.
I think that running has been a constant cycle of getting out of my comfort zone and adapting. People assume that I have always been fast but rarely do they know the time and effort I have put in to getting where I am and that there was a clear point in time where I couldn't run a mile without a near death experience to go along with it. I hope that I won't or don't assume others to be good because of some easier path they took to get there.