These few thoughts are true. When I read a blog, I want to read something that has inspired you. I want to know what makes you tick and what is important. For example, if writing about horses is what you REALLY want to do, then don’t care about how many or how how few want to read about horses. If you want to write about writing, or blogging, or learning languages, then just do it.
Whatever you do, DO NOT write just what you think other people want to read. This is especially true if it is a subject matter that has no interest to you. It will show up in your writing.
Do write a blog though. It is a great experience in writing. Others will be encouraged to write themselves, and you may even pick up a few followers here and there.