I have been in the same boat for a while now. I really have found that the Briggs-Meyer typology test base on Carl Jung or Jungian psychology has helped me. It doesn’t tell you exactly what to do, but it may give you some insight into your personality type. If you do a good search you can find some free ones in order to get your four letters. For example I am an INTP (Introvert, iNtuitive, Thinking, percieving) I can then look up what is typical of my personality type. I simply have used it to learn about myself and I have found it to be pretty accurate. I have heard that if you if you aren’t sure what your passion is then to think of what you do the most of and enjoy doing and also think of those people in professions that you have always found your self having respect for, or seen as a role model and maybe a bit of envy and maybe that is what you really want to be doing. For me I have always enjoyed writing down my thoughts and ideas, I also greatly respect writers, professors, philosophers, psychologists so for me I can see that is where I want to be myself. I went to school for law enforcement, did an internship in a homicide department and I learned that while I respect police officers I do not want to be one. I would rather be the person helping the family get through grief than the investigator. My personality type just doesn’t go along with law enforcement.