Hi J, no there's not an option for that kind of privacy. Everything written here is indexed in Google and is available for anyone to read. Since anyone can make an account here, restricting viewability wouldn't help keep any secrets.
Mods try to edit personal details out of posts [if people write for example, their real name or location] but that's all. In general here we have privacy because we have anonymity. There's no way to link our real names to our forum names, unless we've posted something very detailed and explicit. Mostly what's posted here could be happening to anyone, there's no way to know about others in real life. That's what I like about it. That it's possible to learn from other people's views, that other people have gone through the same experiences and understand how things are.
If there's something in particular that you're worried about in one of your posts or blog posts, let a mod/admin know. There's more explanation of this in Section 7 of the
Forum Rules.