Oh what to do?

What to do what to do? I'm sick of people telling me its ok i'm still young. I hate not knowing what i'm doing with my life. I hate not knowing what will come after college. Life was so simple. AFter elementary school is middle school, after middle school is high school, after high school is college... then what?? I'm used to running my life on a schedule and how can I do that if I can so confused about my future? I know I want to stay within the health care field possibly physical therapy or nursing. I'm not really interested in being a doctor. It's very frustating because not knowing what I want to do slows things down. I don't know what classes I should be taking or what path I should be following toward my career and life beyong college.