Thanks for providing more information.
Sorry for late reply.
As per your description,your symptoms are suggestive of premature ejaculation.
The average male climaxes in approximately 7 - 8 minutes whereas premature ejaculation typically occurs with in seconds to less than 2 minutes.
A major cause of premature ejaculation is psychogenic, anxiety or tension over performance,communication problems in the relationship, even expectation about not performing well, work stress,fatigue many things could lead to it.
However physical cause of premature ejaculation should be ruled out as well so you need to be seen by a doctor and further physical examination prostate may be evaluated or blood test to look for testosterone levels may be considered.
If any disease is not found then you can take a few steps to delay the ejaculation.
This can be masturbating 1-2 hour before the sex, application of local anesthetic to the penis which can delay the ejaculation.
There are some techniques called squeeze & start - stop technique.
You can stop for 30 sec when you are about to ejaculate & start again.
Some medicines mainly antidepressants like prozac are also used sometimes.
Even avoiding intercourse for a period of time and focusing on other types of sexual play so that pressure is removed from your sexual encounters.
Also Psychotherapy is helpful in many cases.
I suggest you to consult your primary doctor first for a clinical exam.
Hope this helps.
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