Is it normal that i hump the floor?

I lay down on my stomach naked and put my weight on my dick and kinda move around thrusting forward into the floor to either a porn vid/pic or to a thought I come up with that turns me on and it's easier then jerking off but still makes me cum but not as much as jerking off. Usually takes me about 5 minutes to cum depending on what I'm using I do it in the shower and put a little body wash in between my dick and balls. Other guys try this and leave a comment for me. When doing this don't have a boner be soft and put your dick pointing towards your feet the other way hurts your balls