So let me get this straight. You are going for Neurosurgery just because you did well on your steps and your classwork, not because of a love of neurosurgery. You probably are looking at money as well. As in your original post, your love was for peds, but you were turned off by the compensation. You will likely not enjoy neurosurgery, will get burned out if you do make it through training, and will be generally unhappy in life. Also, you are limiting yourself to a small geographical area for a field as competitive as neurosurgery. You have a strong chance of not matching by doing that.
I think you need to have a serious discussion with your fiance and a good amount of introspection into your own desires. Don't let friends, family, and others try and tell you which fields you should or shouldn't do. You need to listen to yourself on that one, otherwise you will never be happy.