What does the bible say if anything about feeling sorry for yourself?

or getting angry at others or blaming others for what you do wrong. I have a friend who says he is a devote christian but he is always feeling sorry for himself he looks up and type ographic things to people on the IM he blows up at others if they don't agree with him. He rarely admits that he is wrong even if he is. He say he is a Christian but to me he doesn't act like it.Does the bible talk against any of these actions. Please help I am truly wanting to know. He says that he is because he can recite Bible versus. I am in limbo about Christianity but is he acting like a christian or am i wrong in this