Shy in bed.

me and my partner(both 19) have been together for 3 years and i am still shy when we’re doing stuff. i’ll moan and everything but they want me to talk and say things to them but i don’t know what to say in the moment and it’s just awkward… please give me advice or some things i could say. for example when they ask me how good it feels and when they compliment me or degrade me. i really want to respond in sexy ways but i never do. i’m perfectly fine with responding and coming up with things to say over text but when it’s in person it’s so hard for some reason.