Medicine
My primary career option was always medicine; I always wanted to go to medical school. Actually did a year of pre-medicine in university. Somehow things didn't turn out the way I planned them and I ended up in IT.
But as I discovered, IT is extremely similar to medicine. Troubleshooting computer-related issues, of all kinds, is extremely similar to diagnosing and attempting to find a cure for a disease or injury. In fact, many times when I need to explain to a user that the fix we're trying is just an attempt and not a guaranteed resolution, I tend to explain the analogy of medicine and IT to the user: fixing this issue is just like going to the doctor - he'll find out what's wrong and he'll decide on the proper course of treatment, which according to his knowledge and experience has a good chance of succes - but, for both the physician and the IT specialist, we cannot promise that this treatment will resolve your problem! We're doing our best, based on both theoretical knowledge and practical experience - but we cannot guarantee anything, only that we'll do our best.
Also note that health care is becoming more and more computerized as well. Aside from studying medicine, which is quite expensive and takes very long - aside from the issue of getting admitted - there are 'lower' jobs that are somewhat similar to IT as well: for example, function lab technicians (neuro, cardio, pulmo), or radiology / radiotherapy techs. Same for anesthesia assistant. All of these require a proper understanding of technology.
Reminds me of a pulmonary function lab technician I spoke to about 10 years ago. She came from a maritime background, having been the captain of seagoing cargo ships before making a career switch to becoming a pulmonary function tech in a hospital. There are quite a few people in these jobs that come from different backgrounds!
