ah, each time I start a run, I start recording, and each time I fall, I stop the recording, so, by counting the number of recordings I have, I can have the precise amount of tries I had.
Ok, before starting a match click Squad, in squad there is a little gear, clicking on that gear opens Squad settings. In Squad settings click "private". By setting the code/Squad to private, only people using the code can join the room, thus preventing others from ending your match.