"Is it useful?": Most worrying isn't. Make a decision to do something or to let it go. "Does the world owe me this?": No. Don't be entitled. Have realistic expectations and you won't get angry. "Must I have this to live a happy life?": Probably not. It takes little to make a happy life and there are many ways to get those things. "Is this who I want to be?": Act the way you do when you're at your best.