Understanding your own personality or behavior style is so key to knowing what to focus on.
If you are wired to be slow-paced, being in situations that require on-the-spot decisions or short deadlines can be fatiguing, at best.
If you are wired to love interacting with people, taking a job filing in the back room might sap all of your energy, even though you are great at alphabetizing.
There are plenty of assessments and tests to help you understand yourself. Here is a free one I just ran across that uses the Myers-Briggs model.
Enjoy. And feel free to comment here or email me if you want to discuss your results.