Hello, Welcome to HCM, I have gone through your query.First thing you should do is to get rid off anxiety and stress as those are main offenders in many. You can try any of the following methods.You can do squeeze and stop technique.You can stimulate your partner to maximum before getting yourself stimulated. You can deviate your thought to something nonsexual when you about to near ejaculation.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 a Psychiatrist for behavioral therapy and medications like SSRIs -Dapoxetine or chlomipramine. Thank you.