Once again is all it takes
The more discouraged you get when trying to a achieve a specific result, the more friendly routine you need.
If you want to become a runner, and you feel overwhelmed with the effort it takes, consider keeping your gear at hand's reach -- in an available place, for example close to the entrance. See whether using a readily accessible treadmill wouldn't be better. If you find the task boring, consider decreasing your regular distance, or perhaps -- keeping an audio player with an interesting audio book at your disposal. Make regularity irresistible.