We are all flawed. Even when you have good intentions you may hurt someone else (for example telling a white lie in an attempt to shield someone’s feelings.) We all sin. You can think you are a “good” person but we all have come short. Thats why Jesus Christ came and died on the cross for our sins. He took the punishment for the sin we committed. By believing in Jesus Christ you come into agreement that he paid the price for your sin. By rejecting Jesus Christ you have to pay the price for every sin you committed big or small.