You weigh nothing. Your dense body has no weight. Weight is a human measurement of dense objects under pressure. Your weight is dependent on the atmospheric pressure upon your body in a push on push fight that can be phsically seen on a scale, because your body is being pushed onto that scale by the 15psi your are in as your body pushes against that.
according to this statement a solid titainium ball would weigh the same as a solid polysterene ball of the same size