The referee is part of the field. A ball that hits the ref plays on as if nothing happened. If it hits the ref and then bounces into the goal it counts as a goal. So if you are reffing be sure not to place yourself in a position so that a goal is scored off a bounce off you. Move around the perimeter of the play.
Nothing looks as bad as a referee who tries to call the whole game from the center circle.
The league is paying you to be in the correct position to make the call and that position should be no more than ten feet from where the ball is in U6 or U8 and no more than 20 feet in U10. If you are not in shape to move around find something else to do you are too lazy to referee. Smile and be helpful. When you inspect for equipment check to be sure that the shin guards are covered by socks and that there is no front center cleat on the shoes. Lots of players use baseball cleats which are acceptable if the player or parent will grind down the front center cleat.