BECAUSE I CANT PIN A COMMENT, I HOPE YOU DEAR PLAYER READ THIS
The round does not start until you use the referee's flag. To get the flag, use q/e (interact) on his hand that is holding it. The referee is the guy in the black and white garb
(Another note: Please try and close any applications that may take up a lot of memory, like editing, animating, etc applications, before running the game. You'll probably need the performance.)