Second this whole thing. Wasn't a runner growing up, recently ran a marathon which was fun, now I am back to just running 5 miles for regular exercise. Honestly got into it as a mental break after work, took to listening to podcasts and audiobooks while running. Don't go too fast, don't go too far each time, the act of having done something is the only thing that is important, even if you walk half of it. Exercise is there to make you feel better, mentally and physically.