When I first started playing way back in Starcraft Broodwar, I would get anxiety right before the game and looking back I think it really hinders my play alot. I would overreact, and my hands would get all shaky and I can't play very well. I think what helped me is that to think that it's only a game, losing would not matter and I can only learn from it, that's when the anxiety started to go away.
Bottomline : Play with a rational mind, don't let emotions overwhelm
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