internal dialogue

Lately I have found myself having this internal dialogue all day long. I will name the players so you can understand.
1. Lazy me
2. Healthy me
3. Just plain old me

Here is the scenario:
I've gotten up at 5:45 to get to the gym to workout. I finally get on the tread mill and start chugging along. Just plain old me thinks: Oh this is good I can do this, good job! After about 5min. Lazy me thinks (in a loud booming voice ): I'll never be able to run, I'll never accomplish anything, I should just quit now! As I get down and feel like I can't do it I hear this squeaky little voice trying to scream(healthy me): You can do it, it is not that hard, just push yourself harder.
This happens at least 8 times in a 30min workout!!

How about you? do you struggle with an ugly internal voice too?