Help need help with having sex?

Sex is nothing like porn...i'vd done porn before and honestly thank god ot was only once, it was way awkward, i'm having sex with a girl and the director comes into the shot to tilt my body the correct way for the best angle, which is fine and then 10 minuites into it we all break for lunch, and two hours later we return to shooting, took us at least 8 hours to shoot one stupid scene, at least the dialougue didn't suck, there was a real story.So don't expect it to last 30 minuites, not as fancy as porn. You can only have sex wrong if you do one of a few things, get rough you knock her out when you slam her head accidentally on the head board of her bed.You are so timid she doesn't feel it or, you only go fast for 10 seconds before stopping just as she gets into it you f*cking stop.Don't do that. I had a friend that did that his girlfriend kept telling us she hated it when he did that she was forced to fake orgasms.Worst feeling in the world i guess when you can't satisfy your woman.