When you blog, be prepared for your mother, your roommate, your enemies, the government, your school administration, anyone on earth to read it. If you don't want a certain person to read it, make it private.
Stand by what you write, stand by what you say.
It reminds me of this old thing someone once told me - "If there is one person you could not tell what you are currently doing, you're probably doing something wrong." It doesn't mean that everyone has to accept what you're doing, but it does mean you must be able to stand up to anyone who might confront you on your actions.