Help! I've never been on top!

Megan
Ok- I feel embarrassed admitting this but- I'm scared to "take control" while having sex and getting on top to ride my boyfriend.  I worry that I would have to keep the rhythm, move the right way...what if my partner doesn't like it?  What if I'm as awkward as I feel?  Will he be able to tell I have no idea what I'm doing? Can any other girls relate to this or have any tips for riding your man? I have read that being on top is often the most sexually pleasing position for women.  Even though I'm scared to try it's something I want to overcome. Please! I need advice!!!