Who Own's My Thought's?

If I start this "blog" and begin sharing the news I so far been storing up in a journal or program on my computer do I still have control over this information? I plan on writing a book someday and I would hate for someone to run off with my silly, goofy life and steal our thunder!?!? Is a blog proof enough that it's mine or am I just paranoid.... overthinking it too much.... hmmmm. Just some random thoughts before getting started....

Sam