I m single male 30. how do i generate more sperm in body as i done wrong thing with my sexuall life now.and i m ejecting in few seconds.

Different issue: You probably at your age have sufficient sperm count. You are more concerned, i think, about the ejaculate volume. This is largely from the prostate which should be in peak condition at your age. Do you have pain on ejaculation? Have you had a std? Best to check with your family doctor or a urologist if your volume is too low. And you could also ask about premature ejaculation.