how soon is soon? if your pleasing your girl then theres not a problem? unless you want to just last longer?...having marthon sexual intercourse with a chick is not to good unless she wants it that way!!..most don't ... a good 10 -20 minutes of non-stop thrusting is usally enough for any girl/woman,anything longer than that may just cause problems on her end...like rubbing her raw..ouch!
if you just go in and you have to ejaculate like in a minute or two then just take your time like the other poster mention pull out when you get the erge...use your fingers toung...while your letting it subside then go back in and maybe try not to thrust so hard and fast but most girls like it like that..I know Mine does...you just have to learn to control your erge! once you get that you will last longer! try to masterbate before sexual intercourse an hour or two before...that may help you last longer also!
sounds like your just to sensitive down there?