blogging in a college course

I never thought I'll be blogging in any course I take. I've heard of blogs, I've read over peoples blogs, but never created a blog myself. A blog is a personal diary of a person's thoughts, etc. Blogs often contain personal opinions, beliefs, etc. I'm not an outspoken person and don't voice my opinion that often, so I'm not one to post my thoughts on the web. But there are some thoughts worth posting.