I don't know if you "find" passion as much as you "feel" passion. What interests make you smile? What interests would make you want to get out of bed every day and be excited about participating in?
I personally enrolled in college with no clear direction of what I wanted to do with my life. It wasn't until freshman orientation, where they walked through all of the degree options, that it finally clicked. I heard them say a degree that filled me with excitement, it finally made sense, I had a direction. I tell you this to say that we all find our passion at different times and in different ways.
One of the best ways to witness what passion looks like is to surround yourself with people who are living examples. Associate with—and be inspired by—men and women who are inspired by their work. You never know what might trigger your true excitement!
I wish you the best of luck in your search and I hope you find something that excites your soul!