I don't poop and I only go once in a while, and im 16 im gunna die right?

More fiber. Constipation is infrequent bowel movements or difficult passage of stools. Constipation is a common gastrointestinal problem. Most cases of constipation are temporary. Simple lifestyle changes, such as getting more exercise, drinking more fluids and eating a high-fiber diet, can go a long way toward alleviating constipation.
Food allergy. Constipation is a combination of hidden food allergy causing inadequate emptying of bowel contents. The other cause in young people is adrenal stress due to poor sleep, high stress - when body goes into stress mode it is in a flight or fight response (survival mode) so does not allow body to relax and poop, third it is a sign of poor digestion - cause hemorrhoids, diverticulitis need help - commen.