No, pages and posts are different from each other.
With a blog you have only one posting page. It may be called "blog" "home" or "front page"
It is a dynamic page. That means it changes every time you add a post.
Then with WordPress, you get some "bonus" pages, unlike with many blogging platforms where you have posts and archives of old posts. Blogger allows a "profile" page, but it's not formated like the rest of your blog and is quite generic.
These extra bonus pages are static pages where you can write information that doesn't change such as an "about" page, or "books you should read" or "basic information." You can't make posts to these pages, nor can you categorize or tag them.
If you are planning to write about several topics, you obviously can set up separate blogs for each topic.
But if you want to have only one blog, then what you want to do is assign categories to each post according to the topics you write about. Say you write about poetry, and other stuff. For each post you write, assign the appropriate category. Then use a category widget in your sidebar so your readers can choose to read about only poetry or personal stuff.