You have the authority over your personal deportment, that is your behaviour or manners. Self governance does not mean you can act any way you wish.
It simply means you chose (under your personal authority) which boundaries apply to you. This decision must be undertaken with consideration paid to the influence of social and cultural norms ( both legally defined, and common sense ).
Impact and Influence
Your personal choices which guide your daily deportment define how others perceive you. Taking control of these choices and being sure to practice good governance is a simple way ensure others view you in a positive context.
Acting in the moment or solely according to your personality (i.e., your go to behaviours) without applying some level of constraint can result in others discounting your value to some extent.
Conforming to both your needs and others
Individuals perceived by others to provide high levels of value typically are under control. That is their behaviours satisfies everyone (including themselves).
They have developed an inner code of personal behavioural governance which allows them to tailor their action most appropriately both to the situation and to other peoples needs.
Not a Bad Word
Often I run into people that describe governance as a necessary evil. Something to avoid if possible. While this is usually focused on corporate governance it does apply to the concept of governance holistically.
I respectfully disagree, the practice of good governance will almost always, if practiced judiciously, lead to positive outcomes. Personal governance underpins personal greatness.