How do I start thinking like a teacher

I think I have started to think a little more like a teacher, rather than a student. I have been trying to figure out why teachers do the things they do. Such as why a teacher might get angry when students as a group have failed a test or project, it is not because they are mad at the students but because they are frustrated with themselves. The teachers feel that they themselves taught the students wrong. Other than that though I have not felt like a teacher yet.