WarpMyMind

Ok my girlfriend and I have gotten sexualy intament resently and I have a slight problem, I last to long. I fear the problem is at my end for I can last for over 12 minutes with out orgasm. Now you'd think that would be a good thing but in my case it's irritating! Could I doing something wrong or maybe its the condom I don't know but ah! I guess it's because I knew at it. Summer tells me its alright and says its ok but I want her to feel the greatest she's ever felt and I don't want her to lie and say yeah I came when she really didn't because I lack what it takes, any suggestions?