Walking is different. It's almost always pleasant, and the feeling I get after a good walk is similar to the one I get after a run (though I usually have to walk about twice as far as I would have run.) During the walk, I experience a calm, meditative peace that I really enjoy. I don't even need to have headphones on to enjoy walking!
If you find yourself in the position where you feel like you have to run to stay healthy, it might be worth mixing it up with walking. And if running is overwhelming, don't underestimate the benefits of a good walk. It's still the most underrated way to exercise.