Yes, it is a hazard of the internet that people over-analyze your grammar. It's all we have to go on. However, as a teacher and grammar freak, may I suggest as a solution that we all become better writers so as to say what we mean and mean what we say?
You want an answer to "You're not my real mom!" How about, "Well, I'm the mom you're stuck with. Forever. Clean up your room."
Best wishes,
Xanny