I’m the same way. I like being able to take it all in and I get crazy stage fright about talking dirty. I’m worried I’ll sound silly and whatnot.
I’d say the time I feel most comfortable is when I’m being genuine. This feels good. I like this. I like when you this. It’s so hot when you this. This is so hot. That kind of stuff.
Be sincere. Don’t be afraid to be vulnerable. You don’t have to be a magical sex god/goddess. Your partner wants to be with *you* so be yourself. You don’t have to wax poetic, just be honest. Honesty is sexy, vulnerability is sexy, trust is sexy.
I hope this helped!