On your blog, you say you want to be a writer and that you've got two books you're hoping will get published and they feature stories from your blog. Publishers want first rights or "first right of refusal." This means they want to be the first to publish original material. They don't typically accept stories that are already published.
Don't take it too hard. Most people don't know this. And when they find out, they take it as rejection. It's not. It's just the way it works. If you owned a publishing house, you wouldn't want to publish something that's already been published, either. It's not professional. It also can't sell b/c it's already out there. You'd want to be the first. That's how it works.
The upside is, your blog is good practice. ;-)
ps: I challenge you to write a post about your life that is dramatic (not comedic), where you are the protagonist, and where you engage our sympathies. I challenge you to do it in a way that shows your *own* shortcomings so that we find it funny. I say this b/c, what I've found to be true is: the true hallmark of comedy is drama. My favorite example of this is Jack Lemmon in "The Outsiders."