It can improve your languages(chinese, english or even malay)!
Plus, you know, its way of expressing yourself. If writing a journal or a diary is a hassle since you need to write it, and there's a tendency of your family members accidentally see your diary and read it, go for blogging then.
You can make your blog a private blog for more privacy!
And, even if you don't private your blog up, if you clear your history and just becareful when you write em, your family nor your friends might not even know you have a blog.
Trust me on that.