How do I ride my pillow?

Okay I am kinda embarrassed about this question, but how do you ride a pillow? Do you like hump it? Do I have to take off my pants and panties? I really like masturbating and want to orgasm, but I'm scared to stick anything into my pu$$y. If you know any other good ways to masturbate without sticking anything in, then you'd be of great help! Oh, and I can't detach my shower head. Thanks so much!