Torrie recently broke up with her longtime boyfriend. Her friends and family believed that Torrie would be upset and depressed; however, to their surprise, she seemed to be dealing with the situation well. One day, Torrie refused to change into her gym clothing for gym class. After her friends made several attempts to encourage Torrie to change, she finally removed her shirt. Running up and down both forearms were numerous small cut marks. Torrie may be engaging in: