Moderation?

As if yesterday's post did not prove to you and me both that I lack self-control, I have had that thought reinforced today. This time the problem is slightly healthier than a milkshake at least; I try to run too much. I used to hate running, but I went from one extreme to the other when my love for it developed. I ran a 10-mile race last November after which I developed a ridiculous injury that kept me from running for about 6 weeks (and made me gain a significant amount of weight). I recovered, and I was trying to take it easy, but here I am injured again because I got a little too confident last week. My mom said, "It makes you wonder if running is worth it," and this felt a little like blasphemy to me. I haven't had to stop completely (yet), but I have cut back and started some new stretches, all the while doing other cardio to retain endurance. It's just frustrating that something could seem so healthy and yet be so dangerous. It also leads me to wonder if I am eternally going to be a victim of my own compulsive behavior. Why can't I understand the concept of temperance?

The positive side of all of this: when I stopped running last time, I wanted to hit other runners with my car because they looked so happy. I didn't have that urge last night when everybody and his/her mom was running as I drove to my friend's apartment.