Today's run went well and it was enjoyable. I kept thinking, this is going to be difficult, but as soon as those kinds of ideas came into my head, I let them go just as quickly. And any thought of what time is it now, how much time has passed. And I ran so much better. Just concentrated on the air & my surroundings, my breath, and running in a relaxed way. It really helped, and all those mental barriers I built for myself were kept at bay. I'm going to try to tackle the 20 minute run this way as well, and see how it goes.
Of course, I was tired and going slowly, but the above really made it all so much lighter.