Riding top

So I've been with this guy for almost 5 months. We've had sex many times but I've never ridin too for him. I did with my ex of 2 years bc I was comfortable with my body infront of him. I'm a girl who likes to please her man but I'm also scared. Because he will fully be able to see my entire body and what if it's not as good as he hopes or expects. Can I please have some advice or tips or anything!?