What is the function of a blog

So I've already speculated about this, comparing personal journals to online musings. So far I've posted twice and neither of my posts has a photo or a link. Doesn't look much like a blog. Looks, reads much more like a personal essay and takes considerably more time and thought. Not like what I've just written which is more like, as my daughter so colorfully puts it, "vomiting on the page." And thus far it doesn't matter because I have precisely one reader. I could invite other people, like my friends or my family. But then I'm exposed. They get to judge me on my choice of subject and what I say. So actually it might be easier if I had readers who were completely unknown to me as if I had actually submitted my writing to a magazine or newspaper and been selected for publication . In which case there is already one level of selection. The type of publication delineates the subject matter and also draws readers who are likely to be interested.

How would anyone in the general public find this blog and why would they read it?