Like I said stangs, life is short and you only get to live once. Just do it and have nothing to worry about. If she says no, she says no...no biggie. Would you rather ask her out and know the outcome, or not ask her and have doubts or regrets later on in life of what could have happened? Just do it. Don't worry so much. Worrying will keep you from enjoying life, and what it has to offer.