We all have experienced things in life that have given us a sort of thick skin, or as some may say pain that has caused up to put up a guard. Protecting ourselves is just part of our human nature, naturally no one wants to be hurt, and when we realize the things that hurt us we tend to stay away from them, or if we do go around the things that have made us hurt before, we go around them skeptically, sometimes with the intent to cause those things the pain that they may have caused us.