Finding the right career

Has any of you guys had any difficulty deciding on which career is best for you? I've taken the Myers-Briggs test and many other personality and career test and nothing helps. I was in the Dental Hygiene and Nursing program but they were definately not for me because of the patient contact. Everyone says you'll find something and others say only you know the answer, but it's just driving me crazy because its making me depressed.

What I like to do is read up on job titles/descriptions; or talk with friends and ask them about their jobs.
When you see something, that interests you, do a little research on it.

Hope that helps.