Here's a fascinating Ted Talk by a young man named Vik Nithy who started 3 companies by the time he was 20.
Why do we in fact procrastinate? It's only partly about discipline issues or bad work habits. There is a scientific explanation for the avoidance.
Nithy explains the monkey in our brains making decisions, and breaks down exactly why we give such respect to the part of the brain that doesn't want to do the task.
In conclusion he offers a clear and helpful set of suggestions to counter these patterns, and get better at recognizing what is going on!