How in the world do i ride

Well today my fiance said I must not be doing it right because I get tired and can only do it for like a minute and said the girls in videos don't have this problem. So my question is how in the heck do I ride do I just bounce up and down on my knees lmao because I feel like I disappoint him. Needless to say he just got a handy and I cried a little.