I don't understand. How do you not recognize your passion when you have it? I mean, don't you feel anything inside while doing what you're doing?
There's a free eBook at
Inspired Money Maker - How To Make Money Doing What You Love called the Passion Project that's very good to find it out. Generally, I would say, look for your purpose first. And then I would choose a
top-down approach to realize that purpose. Well, at least that's what I did.
But still, I don't understand that you don't feel it when you like something.