If I understand you, you are asking about procrastination. You hint at my own perspective about this. I think procrastination is not resistance to doing a task. It is resistance to starting a task (i.e. quitting what I'm doing). I find myself often anxious to accomplish a task (that is I am motivated) but I can't get started. In spite of what it seems, it is not a lack of motivation.
What often works for me is to concentrate on the very first part of the task. Usually this is something trivial like defining the variables for a program or scraping the dishes and putting them in the dishwasher as part of an effort to clean the kitchen. I find this relatively easy to do. I promise myself that if I just do this easy task, I can go back to what I was doing, but once I'm started it becomes easier to continue than it is to return to what I was doing.
What often works for me is to concentrate on the very first part of the task. Usually this is something trivial like defining the variables for a program or scraping the dishes and putting them in the dishwasher as part of an effort to clean the kitchen. I find this relatively easy to do. I promise myself that if I just do this easy task, I can go back to what I was doing, but once I'm started it becomes easier to continue than it is to return to what I was doing.