You described me quite well there. I graduated from university with an honors degree in Business Administration, with a specialty in Finance. As of this day, I just can't see myself spending the rest of my life working in that field.
But, like you eluded to, I'm at a point (or rather, age) in my life where I feel I'm kind of "stuck" because I feel I'm too old to go back to school for another 3 or 4 years to earn a degree in something else. I know that's probably not the case, but the fact is I STILL don't really know what I want to do, so I'm "stuck" doing something I'm not particularly interested in.