How do I start thinking like a teacher?

I feel that I am still thinking as a student. I feel that I still need to learn more about the teaching field and about my subject area. I do not think I am quite equipped with the right tools yet. I also think I need for practice, the only time I get to practice thinking as a teacher is when I'm at the middle school mentoring the kids. Even then I feel like a helper not a teacher. I think if we did more teaching exercises in class, that would help me change over to the teacher side.