No on all counts. People mix and match them to suit their personal tastes.

Bondage can be just that. But most of us, when we see someone tied up and helpless, can't resist doing naughty things to them :-)

Pain needn't include bondage. Some people find it a much more potent expression of power exchange to order someone to hold still for torture without any bonds but the Owner's word.

Humiliation certainly needn't include bondage; it's usually far more effective to make a sub humiliate hirself by following orders.

Everyone has their own favourite mix.