When did you first realize that your perspective on various things in life isn't necessarily the "right" perspective?

I don't know when I first realized it exactly, but some time during my teens. Getting past that hubris of knowing what's best for the world and for everyone else is tough (and many never get past it), but my perspective is just that: one among many. It may be closer to objective truth (the belief in which is another perspective of mine!) but it may not be.