Okay so the short answer is that no, you should not feel like your standing in your boat. When your attempting to hold a stall, imagine that the nose of your boat and each blade are the legs of a tripod. So to make your tripod nice and stable you need to lower the center of gravity as much as possible. To do this get your head right down near the water and keep your blades out in front of you. If the nose of your boat starts to float away from you, use your knees and stomach muscles to pull the nose back towards you. You can also use your blades to make small subtle corrections, but try and keep them gentle - it can be very easy to overcompensate. Finally it can be helpful to remember that leaning forward makes the boat flatten out and leaning back will bring the boat more vertical.
Hope this helps