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This is something a lot of people struggle with. I think it is made more complex by the notion that your work _must_ be your passion, and 100% fulfilling. That's never been the case for me. I really like my job (a lot!), but of course it has some aspects I don't enjoy. And, I love my family, like scuba, travel, etc. So, work and career isn't everything - just a very important thing.
Generally, I find people are really best at what they enjoy. What do you enjoy doing?
Also, almost anyone you meet would love to tell you what they like and don't like about their job. When you go to the doctor, or a mechanic or a retail store or Apple Genius, or anyone - ask them what they love and what they don't about their job, how they got there, etc. Be Inquisitive! You'll find the vast majority of people are willing to talk if you are genuinely interested. I bet you'll start to feel some natural pull towards some direction.