Nah. My mate has one that he has only told his inner circle about.
He is gay and hasnt fully come out the closet to everybody, yet he has had this blog anonymously for 18 months or more, using a pseudonym disclosed to only those who he chooses to tell.
Invent a name, invent an email address, invent anything you like.
Thing is, you might get in trouble for disclosing stuff and they can trace your IP address easily, so you'd have to be careful what you said.
Just do it.