Major Changes

When I first decided that I wanted to be a teacher I was positive that I wanted to teach Eighth grade English, however due to recent discusions between myself, fiance, and family members I have now decided that Early childhood is the major for me. My fears with this choice are; that instead of teaching I will parent or babysit and I don't want to do that, that is not my job and I want to be a good teacher. So how do you go from being a babysitter to a good teacher? I am not even sure how to redirect my lesson plans, focus, anything, HELP!!