Hi, is the penile skin on the shaft of my penis considered normal? i mean, is it supposed to be full or half of the shaft skin.

Incredibly variable: Assume your question refers to the foreskin, it depends on the length of the shaft of the penis. Since there is such variability of the lengths of a penis, the foreskin can compromise almost the entire length of the shaft or very little. Problems that arise aren't so much related to how much of the penis skin is comprised by the foreskin, but rather how "tight" the foreskin is around the glans