Aside from what others have said, it's a really fucking selfish thing to do. I will admit, occasionally I do consider self-harm in some form. But I don't. Why? Because you don't just hurt yourself. Everyone you know will see it. Your parents will worry about if they did something wrong. If they messed up. Your friends will think that you are either being hurt by someone else, or that they caused you to do this. It's not brave, it's not an intelligent coping mechanism. You think you have to feel the pain of it, but physical pain goes quickly. The real pain goes to those around you, who never asked for it. That's who it really harms.