Thanks for your query
is a fairly common condition and maybe primary(if it has happened always since the first time) or secondary( if it happens after a period of normal sexual activity).
You can consult your local urologist
who can advise medication such as dapoxetine
which is effective in delaying ejaculation.
Some other ways to delay ejaculation include using start/stop technique, squeeze method and change of position(woman on top).
I hope i have answered your query
Dr Vineet Malhotra