Ambiguous future! in My life: My choices

My life is completely messed up right now. I m 18 and I really donot know what course my life is going to take. Few years back, I had it in my mind that I am going to become a doctor. But the recent results of the medical entrance exam has left me nowhere. Despite crossing the borderline of scores needed to get a good college, I am in a dilemma whether I may really get it or not. The competition is severe and brutal at the same time. It thrashes you so badly and leaves you nowhere. I am so depressed. unable to share it with anyone around me, I opted for this prosebox entry. I just cannot make out what I am gonna do. Faith upon God seems to dwindle a little bit but still it is there and I feel he is going to help me whatever it takes.