Everyone has bad runs, I have an awful lot.
But how bad really are they? I may set out to do 6 miles, and only end up doing 3, I may set off 6 miles at pace and then implode with 2 miles to go and have to walk.
I had one like this on last week, a 5 mile run at just below my 5k pace as part of my half marathon training. Started off well, probably too well, then with 1.5 miles to go I felt bad. I slowed right down, i didn't have any water and i nearly threw up. I ended up having to take my time, slowed down to a very slow jog for half a mile to help recover.
But was it really that bad? I'm not saying that you've never had a catastrophic run where everything goes bad. But, I tend to think back two last year, when I couldn't run for 300m without stopping. Now I can step out the door and run 5-6 miles without thinking about it.
So it wasn't bad, it just wasn't my best run.
Remember that old aged quote...
Keep running, keep being positives. As a friend once told me, the bad runs make the good runs so much better!