I think the main difference between a job and career are pretty simple. A job entitles you to a personal life. A career requires you to be your job at all times.
When someone asks what you want to be when you grow up they’re expecting a career answer. Nobody expects you to say “I’m just going to work several odd jobs and spend the rest of my time surfing.”
Personally I’ve been struggling with this dellima for a number of years. Apparently it’s impossibe to be a pro video guy, indie filmmaker and make stupid off the cuff comedy films with your friends. Eventually the lines cross and someone from your pro field finds one of your stupid comedy films done in a single night just for fun without any lighting and takes it as an example of your “work” and “skills”.
Luckily this hasn’t happened to me yet, but I’ve been struggling to figure out just how to go about keeping them separated online.