Am I correct to assume the tailbone is different than the sitbones? The reason is that I ride a 2006 Giant Cypress with a Specialized Avatar Saddle. I realized today while riding that the part of my butt that is sore is the tailbone, when I repositioned myself to my sitbones, it felt more comfortable because they were not as sore.

Can anyone tell me what's going on here? Am I sitting wrong on the saddle? I don't think that I'm sitting to far upright, but is it normal to sit on your tailbone while riding? Sorry if this is a dumb question.