Your problem is Premature Ejaculation. You should do Kegel’s exercises to overcome this problem.
Both men and women have a pubococcygeus muscle, you have to keep this muscle in tiptop shape in order to maximize your sexual experiences. Try stopping your urination three times just to ensure that you understand where the muscle is located. Feel your anus contracting (pressure). Always try to keep your other muscles (thigh, back and abdominal) relaxed.
Quickly clench and release your PC muscle for a 10-second period — take a 10-second break. Perform three sets, then take a 30-second break.
Clench and unclench for 5 seconds with 5-second breaks in between — 10 times in a row.
Tighten your PC muscle for 30 seconds and release for 30 seconds — 3 times in a row.
Repeat the first step and you’re done for the day.
If you do this exercise regularly, your ejaculation time will improve. In addition, try to masturbate regularly and holding ejaculation while doing it.