I'll admit running is difficult at first because it requires your active thoughts to keep going. Depending on fitness level (mainly regarding weight, not musculature or cardiovascular), after a month or so of a 3xWk plan, you can start to get into a point where it starts getting more sexond nature and you get more of your mind to yourself and the distraction from running becomes more related to your ability to regularly distract yourself with just your thoughts and/or audio (music, books, podcasts, etc).

But yeah, the beginning is really hard. I used to run, got pretty good at it (would go on 8mi runs with a sub-9 minute pace on the weekend) but then stopped for like... 7 years. Just started again a month or two ago. I can only run for about 25 minutes at like a 12 minute pace. I'm also overweight and over 40 which isn't helping anything. But when I started (or restarted as it were) I couldn't run for 5 minutes straight. I do get shin splints, I was getting sore muscles all over, but slowly I'm getting better at it. At even just the 20ish minute mark though, I need something to distract me. Right now it's music, but I've been considering podcasts as I feel they generally get me more distracted.