I've found that I don't really like the idea of creating my own blog. Seems like it's too personal ~ too much information for the public to read.
But in the same way that you said yours is like a journal, I've always thought of a blogspot as an online journal. But I always think of a journal as very private. Not necessarily because it would contain any secrets or anything like that. Just because it would be really open.
Just because I have an opinion about absolutely everything doesn't necessarily mean I'm going to share all of them with anyone who has an internet connection.
It's probably possible for someone else to create a blogspot. I think I never would though, just because of how personal I think them to be.