Good night girls, it's been a while and that's what worries me, and I …

Good night girls, it's been a while and that's what worries me, and I go out of sorts because of this and don't consider myself a good wife in bed. I can't move my butt and every time when my husband changes position on a saddle, my face turns red like a tomato, I can't figure out what to do ??I get so complexed about this, from instagrams I saw a marathon for eastern dances there a girl says you will definitely learn to move your butt after the marathon, I'm very doubtful. Please don't laugh at me, I hope you understand ???give me some advice on something so that I also succeed like everyone else.