Farnoosh, I think you’re already doing a wonderful job contributing through your blog! If you cannot find one thing to define you, then don’t pick one thing! Or find the overall theme and go with that. Take a step back and try to view your entire life from a distance — the sum of all the decisions and choices you’ve made. How would you define that?
I know It’s tough! I struggle with the same problem. But figuring out what our gravity is — what holds us together and allows us to focus — will greatly improve our ability to change ourselves and the world around us.