In high school I decided to become a teacher, or day care teacher. I didn't want to be a teacher in a "real" school. So day care it was. I actually got into it because my sister-in-law was a day care teacher/director. So I went to college and got my Early Childhood Education credits. I worked in child care for 12 years. In those years I was an office manager (handling tuition and balancing the books) and assistant director (with pretty much the same duties as the office manager). That's when I discovered I liked accounting. It's actually kinda funny because my mom always told me I should take bookkeeping. But I thought that was boring. And now I am an "accountant" (not really, but that's what my title is at work) and have been for over 4 years and I finally went back to school to take accounting courses. After the fact.
I do like my job. I don't like how the company is ran or some of the people there, but I like what I do.

Take your time, it will come to you. But definitely take some classes. I think I will take more classes even after I get my accounting certificate. Not sure what courses, but I'll find something that intrests me.

My niece is 18 and just started college. Originally she wanted to be an interior designer when she was a senior. Now she doesn't know what she wants to be. Guess what she's taking in college?? Yup, Early Childhood Education courses. But that's because she works at the after school program and she can get more money with more ECE credits. But she isn't sure what her major is yet. And she has time to figure it out.

Good luck in what ever you do. You might have several different jobs until you find what you truly enjoy.