Running capacity and speed increase was very non-linear for me. It was like day 1: running is impossible, I choose obesity. Day 14: wow thats the furthest I've ever run! Day 60: I guess that was the farthest Ill ever run. Day 180: maybe not. Day 400: I just dont want to run anymore. Day 500: I can run as far as I need to if I hate myself enough and crave agony.
Real talk cause I love running, trying running your 1, directly away from home, then walking home. This method obviously forces you to travel the second mile, but you should unlock your mind from thinking you gotta move "full speed" for it to count as a workout.
I run lots of trail miles and if I'm "not feeling it" I spend that discipline to actually get it the door. If I end up just hiking a few miles, oh well, at least I got out.