When fear lives in us, as opposed to being a momentary reaction to something new, we become warped. We respond to situations out of fear rather than out of faith, and make pretty poor disciples. What the Angel announced was supernatural. Some people say we shouldn't question God, but Mary did. Questions cause us to grow and learn.
Questions stretch our minds and hearts and increase our understanding.
Questions and the exploration for their answers contribute to our faith, even if the questions themselves may ultimately go unanswered. Mary's question arose from faith, not doubt. May it be to me as you have said. Here is a teenager facing misunderstanding and rejection from her family, her betrothed, and her townspeople. And yet she agrees.