That depends on ones deffinition of weak, does it not walkingdude?

Phisically I would not presume to guess.

Willpower wise?

I have seen submissives display amazing feats of willpower.

Weaker than your Domme in regard to the capacity to exert the force of one's will over another?

I would presume by that meaning then one could say yes, you are weaker than your dominant.

Such a distinction is of course dependent upon an individuals point of view.

Your preception of your dominants power over you could be termed as "strength" if you wish to see it as such.

Though it is my humble opinion that to consensually submit to the will of another that one precives as more dominant (or powerful or stronger or whatever you wish to call it) than ones self also takes a certian kind of strength as well if not a great deal of courage.