Pain just barely to the right of the belly button only hurts when I push down feels like a bruise pain or something similar to costochondritis?

A muscle bruise or. This could be a a bruised abdominal muscle that runs vertically along either side of the belly button (umbilicus). Interestingly, some people get an infection inside the belly button, and you may not even see it from the outside, because it is under the flap of skin that cover the belly button. Or is it that the button or belt buckle on jeans is too tight and pushing into your abdominal muscle.