My age is 19. i ejaculated within 3 minutes and 15 seconds while masturbating. is it normal? is there anything to be worried about?

Three minute man: Congratulations!, like an egg you are "hard boiled" in three minutes. That's great if you need to eat quickly or need "tension" relief. However, most women make very bad jokes with their female friends when their sex relationship leaves them feeling "fulfilled" but unfulfilled physically or emotionally due to you being "Speedy Gonzales" in the bedroom. Keep that in mind for a future relationship.