Parallel. Book One of The Kasdtien Cycle

Mark awakes from a dream into a nightmare. Everything he thought he knew has been a lie. He is not who he thought he was, his parents are not his parents, and the Earth is not his home.With his new found Psychic abilities, and the help of a strange girl from a Parallel world called Quell, he discovers the truth. With the help of friends, and the danger growing by the day, Mark must flee the only home he's ever known and find his way back to his true home and the war that's brewing there. Standing in his way is his Parallel, Tyrren, who seeks to kill Mark and obtain immortality.
But even on Quell, Mark will find that a world away is not far enough.