is very common and is usually not associated with any disease but may be due to anxiety
. However it is sometimes associated with infection
of male accessory glands, which is treatable.
You can learn to control PE by doing this exercise- pull your muscles that you pull at the end of urination for few seconds then release repeat this several times daily. Another is stop-start technique: when you feel that you are going to ejaculate stop the sexual stimulation and divert
your mind, the penis will relax, after sometime start the stimulation again and repeat the procedure. Over few months you will gradually increase your ejaculation time.
Also there are medicines which can help if you want then only - ask private question.