If you're not interested in blogging about yourself, I'm sure no one else will be either, much less follow you.
The best way to decide on a blog topic is to ask yourself, "Would I do this for free?" If the answer is certain, then you have found your topic.
If you're already working, you can write about your skills, your work, your perceptions.
If you read newspapers, you can write about your thoughts and opinions on the news, the biggest difference between blogs and newspapers is that bloggers have their own opinions.
The biggest difference between a blog and a newspaper is that a blogger has an opinion.