I think you have a great defining moment here, but there is one other that is just as foundational in regards to solidifying ground upon which one can grow away from childhood - that in almost all cases, we're all lost and doing some rendition of our best.
As a child we generally assume everyone "above" us knows what they're talking about. Authority derives from behind the curtain that is defined by a hope that whomever is leading us knows what the hell they're doing. And suddenly, when we realize that they don't - that we're all lost - we can start forming our own vision of the world as we would prefer to see it.
That, along with ownership of the personal responsibility you mentioned, defines the difference between childhood and coming into ones own. I think the two are complimentary and I don't believe either revelation exists without the other.