In Lars and the Real Girl, one character asks another, "How'd you know that you were a man?" Well, it's not like you're one thing or the other, okay? There's still a kid inside but you grow up when you decide to do right, okay, and not what's right for you, what's right for everybody, even when it hurts...
Like, you know... you don't jerk people around... you don't cheat on your woman, and you take care of your family... and you admit when you're wrong, or you try to, anyways. That's all I can think of... it sounds like it's easy and for some reason it's not.
Like the perspective in
David Foster Wallace's 2005 commencement address at Kenyon College, this is the base-line for responsibility.
Why is it still too much to ask?
If you haven't seen Lars, you really should.