Is it normal i shake my hips back and forth

I just noticed this recently, well because my friends. Whenever I'm going to bed, watching TV, sitting by someone I like/trust I start either 1.) moving hips back and forth if I'm on my side, like rocking backand forth sort of. 2.) Sitting, I rock forward and back, or even up and down (I've been made fun of for that one -_-) 3.)I also cross my legs and rock back and forth when sitting. Hmm I'm thinking it's something about relaxing/being relaxed, just wondering if anyone else does this. I also rub my feet together, not as often though. I never notice I'm doing it either until someone around me asks wtf are you doing. Must look odd so yeah mmk. Is it normal?