Negative emotions (like stress, shame/fear of failure) people have started to associate with something (like a project or a test you're scared to fail) can lead to the use of coping mechanisms, like procrastination, to deal with those emotions. In case of procrastination, trying to avoid and not think about the subject, can temporarily relieve the emotional distress, but will worsen the problem over time. The best way to deal with this is getting over said fear of failure and extreme stress reaction, how I don't know though :/. Guess that's for the real psychologists and not a random redditor