Teachers' College -- is it possible to find out you don't want to do this for the rest of your life ?

I am in teachers’ College right now and I am disillusioned with teaching at the high school level (let’s make sure to distinguish that from other levels, such as primary or College/ University). I was a TA (teaching assistant) and I worked with a department for 2 years while doing my MA. I went into teachers’ College because I loved leading tutorials.

However, teaching at the high school level is very different and although I wouldn’t say I completely hate it, I do not see myself doing it for the rest of my life. I see myself getting into upper-level teaching of some sort. For any teachers, has this happened to you? How do you deal with it and can one say that what I am going through is normal and that I will adjust to teaching?