Ruler- the Definition

A "Ruler" is someone other than yourself who orders you to act in certain ways. A leader "leads" by example; a Ruler orders you around. A Ruler may demand that you act in ways that violate your values and principles. Government and bureaucracy is composed entirely of "Rulers".

While you probably regulate your own behavior, and therefore "rule yourself", I do not consider you a "ruler" over yourself, as such, since you still will probably act according to your own values and principles. You are on equal footing with yourself, and not "over yourself". That is why, when I use the word "Ruler" I am referring to someone external to yourself.