No rhythm, HELP

So I haven't exactly been with very many "partners" in my life, two to be exact.. The first was with the guy I lost it to, a long time ago. And now with the guy I've been with for two years. The problem is that I have no rhythm.. That's awful, I know.. And when I'm on top, it's a major problem.. I hate being the one on top because of it. It's like I need his help to keep the rhythm going because I'm awful doing it on my own. Help, advise, ANYTHING??