How Can I Tell If Someone Has Visited My Blog?
how do you see who has visited your website?"........
"How do I know how many people have read my blog?"
The most simplest answer to this is to install a counter on your blog.
If your blog is on Blogger.com then you can view their home page and navigate to where they talk about Blog Add Ons - which include counters. There are a lot of "free counters" all over the internet and the most simplest ones involve you copying and pasting the counter code and adding it to your blog.
There are also a number of more sophisticated counters that will give you more information than just how many visitors have visited your site - there are a number of free ones available. They will give you information such as the location of your visitor, what time they visited your site, their domain name, their operating system plus a whole lot more.