No disrespect but to what was your first obligation before you had a wife and kids?
I'm always tempted to interpret this kind of statement one of two ways: either your life before your family was so miserably empty that it gave you a purpose (nothing wrong with that) or you're borderline schizophrenic that you can fool yourself (or worse, truly believe) that your personality suddenly morphed and you're now a different individual who will be just as content with a lifestyle radically different from what he ever had, obligations as well as satisfactions that cannot be possibly imagined until you actually cross that line and have kids.
I personally have a hard time believing people can change that much...