What to do in missionary?

Grace • 20. College Junior. In a relationship. Bicurious. Sexually active.
When doing missionary, what the hell is there for me to do??! I usually run my hands through its hair/down his back and kiss/bite his neck/shoulders.  But honestly I just feel like a dead fish. I don't want to just lie there but I feel like there's not much I can do. What do you do?