Also, wear a condom. That helps you last longer.
I know very few guys that last past 5 min. The guys in the pornos are just abnormal. Its just a mental thing. You just have to learn to have super mind control and keep from peaking while keeping it hard the whole time. Tough stuff, but it can be done with practice.
You're situation isn't uncommon.
Dear Shan,
This is a question for the sexuality forum on Medhelp. I'm sure you will get your question answered there.
Sincerely,
Dr. P.