Personal discipline means submitting calmly to a painful experience and controlling the mind and the will in the mastery of a situation or in the conquest of bad tendencies'
Self-control is related to personal discipline. It means the exercise of restraint over your impulses. You are hungry but self control keeps you from grabbing the food set before you. You are annoyed by the person in front of you but self-control helps you to keep the angry words that you want to throw at his face.
The practice of self-control is demanded of you by polite society. Often times you regret later the unkind word you have uttered in anger.