Hi Thank you for asking HCM I have gone through your query.Usual ejaculatory potency is 4 to 8 minutes.If less than that then you are most likely having premature ejaculation.You should rule out diabetes and hypercholesteremia by checking your blood levels of sugar and cholesterol.A high level of this also can cause premature ejaculation. You can try methods like squeeze and stop techique.You can stimulate your partner before getting yourself stimulated.You can deviate your thought to something nonsexual when you about to near ejaculation.You can try sex positions which gives lesser stimulation to penis.You can put on a condom or condom with anesthetic which will decrease the excessive stimulation on penis and there by prevent premature ejaculation. If all these not helping then you can approach an Urologist or sex therapist or Psychiatrist for behavioral therapy and medicinal management like antideprssants. SSRIs like clomipramine and paroxetine are prescribed for this.Dapoxetine is another SSRI which can be used in need (SOS) also. Hope this may help you.Let me know if anything not clear. Thanks.