Anything at all

What would you be if you had the ability to change into anything? But you can only change once and you can not go back. Would you change at all? Would you become a big terrifying monster who could crush anyone in your path? There's a price to pay for that life. Would you shrink, to the smallest creature imaginable so small no one would see you much less care. And if they don't care they can't hurt you. You could all but disappear. No, there's a price for that life too.