Why do females always say I'm "tense"?

"You seem so tense."
"Why are you so tense?"

Yet in reality I'm completely calm and not even nervous. I literally have nothing to say to this. It's just baffling.

You forgot that women are children. You arent tense, but you arent making them feel at ease enough. Thats why theyre saying that. Entertain them like a kids birhtday party.