My legs went limp during the football match. What happened?

I've had this situation before, or because of psychological pressure. If you are like me, you may even feel a little nauseous and want to vomit. I usually squat down and cough or sit on the grass to relax my muscles. After entering the game, if I have good physical strength, I will run more. Once you get into the state, you won't be nervous before the game starts. After listening to you, I don't have the strength to shoot, so you may play forward, shadow, winger, avant-garde or front waist position. If it's a front line, try to relax yourself and pass more balls. If there is no big mistake in passing the ball, you can try to pass the ball. It doesn't matter how many times you shoot it, because it's still an adjusted state. If it is really a team, no teammates will blame you. Once you enter the normal state, you will put it down, and then all problems will not exist. The ultimate reason is that the atmosphere of the official competition has affected you, leading to psychological tension, so you can't play it out.