How'd you deal with stress while playing ?

So i have this problem, when i play normally just for the shits and giggles i play pretty well, good win rate etc, but whenever i actually try to play my best, i start stressing out, my hands and legs shake so much that i can't land any skillshots, hell i even miss all my point and click abilities and auto attacks and to top it off i seemingly lose the ability to use the part of my brain in charge of decision making I've just bought myself a new computer and have been waiting eagerly to be able to finally play at the best of my abilities, but then i realised that if i stress that much i'll probably just end up hardstuck gold 5 if i started ranked Does anyone here experience that kinda stress, if so how do you deal with it ?
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