Procrastination is inevitable, it is something everyone does. But it is something everyone does to their own extent, some let it get out of hand and some do not. Everyone puts things off until the last minute sometimes, but procrastinators chronically avoid difficult tasks and deliberately look for distractions. Procrastination in large part reflects our perennial struggle with self control as well as our inability to accurately predict how we'll feel tomorrow, or the next day. "I don't feel like it" takes precedence over goals; however, it then begets a downward spiral of negative emotions that deter future effort. Procrastinators may say they perform better under pressure, but more often than not that's their way of justifying putting things off. On the bright side, it's possible to overcome procrastination, with effort.
When you set goals for yourself you are actually making plans for your Future Self. The Future Self values long-term rewards. However, while the Future Self can set goals, only the Present Self can actually take action. When the time comes to make a decision, you are no longer making a choice for your Future Self. Now you are in the present moment, and your brain is thinking about the Present Self. So, the Present Self and the Future Self are often at odds with one another.
"The pleasure principle does not abandon the intention of ultimately obtaining pleasure, but it nevertheless demands and carries into effect the postponement of satisfaction, the abandonment of a number of possibilities of gaining satisfaction and the temporary toleration of unpleasure as a step on the long indirect road to pleasure" Sigmund Freud
"The consequences of an act affect the probability of it's occurring again" BF Skinner