My friends say that they can have sex for half an hour but I come after two three minutes only. What should I do?

Friends are notorious for misleading each other. It is highly unlikely they're lasting for that long since the average time for ejaculation from the start of intercourse is approximately 3-6 minutes. Men who have premature ejaculation last for a minute or less before ejaculating. If you're averaging three minutes or more, there's little to worry. You can try some home remedies such as focussing on distracting thoughts to delay orgasm or gently squeezing the head of your penis before hitting orgasm. Moreover, if your partner is happy, then all is well, my friend. As for the other friends, ignore them!