Reading Atlas Shrugged. I never felt any pleasure in helping others or making a personal sacrifice for someone else. Traditional morality of course taught me that this is bad and so I did it anyway even though it hurt me. Worst, other people would shame me using this to their advantage. After I read Atlas Shrugged I realized that there is nothing wrong in how I feel and it's perfectly okay to be selfish. Not being a doormat does wonders for one's self-esteem.