Welcome to the internet. You're one of millions of victims. Your best bet is just to kindly email the blogger to take it down. if not, then you can do a DMCA an

Welcome to the internet. You're one of millions of victims. Your best bet is just to kindly email the blogger to take it down. if not, then you can do a DMCA and cross your fingers, but the chances of something happening is 1:1000000. Just continue writing content, and building reputation and the blog that copied your content will not rank as high as you do. That's about all you can do.