Trace your ancestry back far enough and we all came out of Africa or so the anthropologists reckon. In the UK and Western Europe, the indigenous animistic beliefs of the Celts, Romans, Germanic tribes and many others were systematically stamped out over several hundred years even extending up to the Saami. What is now called witchcraft was once a form of belief very similar in many respects to shamanic practice. Emma Wilby has written a wonderful book called 'Cunning Folk and Familiar Spirits' which parallels the similarities between UK animistic beliefs and other shamanic cultures through studying the court transcripts of the witch trials. She makes a compelling argument for an existing and long established shamanic tradition in the British Isles and Western Europe.
No matter who our immediate ancestors are or where we live now, we all, every last human being on the planet, have a shamanic ancestry somewhere along the line. If your spirits are calling you to a shamanistic way of life then trust your experiences and forget what others may think or say about you. It really doesn't matter what label you give yourself, Christian, Buddhist, Pagan, Animist, Wiccan, Moslem etc etc, someone, somewhere will take a pot shot at your beliefs because it doesn't match their narrow vision of what is right. All you can ever do is be true to yourself.
The West and the 'white man' has never needed more help from the Spirits as we do now. If you can be a bridge between ancient understanding and contemporary expectations then that can only be a good thing.