What do I do if I lost my motivation and perseverance?

I have to seem to have lost my drive to succeed. All throughout elementary and middle school, I received many awards and recognition, and I always was on the honor roll, never off of it. But as I entered high school, I have seem to lost me willingness to strive for what I want. After being faced with so much competition, I began to wilt as the years went out. Now as a junior, I don't know who I am as a person anymore, I am not myself. I don't know what to do anymore.