You could change your appearance and lifestyle. Tanner is right, altering our DNA isn't possible yet. Why don't you sharpen your teeth and only go out at night? I'm working on a spell to become a vampire actually, one person is going to try it. I doubt it will work but there is the very slim chance of a medical breakthrough with it. I mean very slim like a 1% chance. 1 in a trillion.
So until a breakthrough comes keep on dreaming.