My whole life I didn't know what I wanted to do, but it had to be extraordinary. Now, my life didn't turn out to be exactly “extraordinary” but so far, I've been able to accomplish most of my goals on some level, and I've collected a few good anecdotes along the way.
When it comes to living, you don't have to do extraordinary things to make an entertaining best seller. Heck, half the books on the shelves are about ordinary people getting through just regular ol' life, only told in an interesting way. For your blog, think about how your life could be told in an interesting way. What are the lessons you've learned? What are the stories that make you, YOU?
It's all there, it just takes some time to find the best seller inside.