How did you decide on a career path?

Jordan
I just read through a "top post" on people's annual household salary and so many people were talking about their jobs and different schooling they went in to and it just made me feel.... I don't know. Longing maybe. 
I've wanted to go to college forever, but I've never been willing to take out loans. I could pay for my community college myself for a while but eventually had to move and got into debt and couldn't catch up. 
Now I'm in debt from unexpected events combined with poor choices slowly making headway but I would love to go to school. I want to be challenged and I love to learn. I've always loved school and at one time considered becoming a teacher. But now I'm not sure if the amount of loans I would have to take out would be worth it. I don't want to be in debt forever. 
And then when I think I've finally decided to accept the debt and go for college, I start feeling guilty because I'm not sure what I even want to go to school for leading me to back out of college altogether. 
How did you choose what to go to school for?
Do I need to just suck it up and start and find myself along the way?