My brother is 18, looks like a model, is succeeding in college and enjoys all sorts of social/dating opportunities. He has it all. It actually makes me depressed to be around him because it makes me realize how ****** my life is. Yet half the time he walks around putting on this emo kid attitude and just being unpleasant to everyone. He will especially start being rude to our mom, who is completely nice to him and generally gives him whatever he wants. It is like she is his emotional punching bag. Basically, when he is happy, he is nice and pleasant, but then as soon as something happens to put him in a bad mood, he starts acting like a total jerk. Usually it seems to be things completely unrelated to anything going on in the house, like something going on with his social life.

Is this a normal teenager thing? I know teenagers usually have emotionally unstable type phase, but this is pretty ridiculous. He seems to be lacking of the slightest hint of consideration for the rest of us, as if he is the only person who exists.