ANSWERS: 1
  • 13 is not small for a 13 y/o. You have not even come close to your full growth in any aspect. All parts of your body may continue to grow up until about age 25. As for the black line, it could be a vein close to the surface of the skin, but more likely it is the urethra, the vessel that carries both urine and semen out of the body.

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