I am definitely my worst critic!

I am definitely my worst critic! For instance, I am constantly working to run longer and faster on my morning runs. I tell myself beforehand that the point is just to keep my heart rate up for 30 minutes and nothing more, but once I get going, I want to do more more more! Sometimes it's a good thing though. Whenever I try and run 10K on the treadmill, I usually get tired and want to stop halfway through, but my stubbornness keeps me going as I tell myself "I set a goal to run 10K this morning, and I'm not stopping until I do!"