Not comfortable saying sex words

This might be weird to say but I’m curious if anyone is like this. I’ve never been a fan of actually saying the words “dick, cock, pussy or vagina” idk if I feel like it’s cringe or too dirty for me to say out loud? But my boyfriend wants me to say dick or cock whenever I ride or stroke him. I felt so embarrassed last night as I’m riding he was like “tell me what you’re doing… say what you’re doing to me” and all I can do is laugh it off and not say it. I honestly don’t know why I don’t like to use those words.