Is there something wrong with me??!

When I have had sex there is a point where I’m numb. Numb as in I don’t feel his penis inside me like I’m just laying there and I can See him thrusting but nothing🤤. At first it felt good, but after awhile nothing. He be like" I feel you walls getting tighter "or “your twitching (my walls)” and I’m sitting up here thinking I don’t know wtf you are talking about. Is that normal or is it just me?