Well there are special condoms that are laced with a numbing agent, so people with a problem like you can last longer in bed. There are other remedies such as herbal treatments and such, but I've heard that the numbing condoms work best. Then again, it's a quick fix for a big problem. Like using a piece of tape to patch a fuel line. In the long run, you gotta get a real patch put on it, but the tape works temporarily.
Anyways, this question has been asked before here:
http://www.ehelp.com/questions/10434016/about-my-sex-timing
and here:
http://www.ehelp.com/questions/10435093/what-to-do-with-a-premature-ejculation