Be honest with yourself about what sparks you and take action on it. Don't worry about finding your one true "passion." That's too abstract of a concept to figure out logically. Instead, start by acting on the small things that excite you each day.
An article I wrote for the Huffington Post on 25 questions you can ask to know yourself just that little bit more. Knowing who you are and what you want is the first step in finding your purpose. Click through to read the post!