On our team, i am the team captain as well one of the drivers. Thats almost double the stress; however, my team and mentors are very supportive, and they know that everyone gives a 110%. I always tell my team members no one is allowed to criticise any member of the team except me

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I have a a simple theology that helps me and my team mates reduce the stress: " Its not the result that matters; however, the effort we put in counts". So basically, i beleive that we cannot control the output, so there is no pressure. This helps me relax.
For every driver out there, its always sad to be eliminated or even lose, but i know each one of you gives all you have to drive your best, and there has to be a loser. But in FIRST everyone who builds a robot, shows GP and cheers no matter what happens is a winner, so basically everyone in FIRST is a winner.
And for all team members and mentors, always support you drivers, because untill you beleive in them they cannot beleive in themselves.