I don't know but for the most players it's happening the opposite ,they are excited, including me.
Maybe you are anxious for some reason?Maybe you are afraid that you will make a mistake which will cost you a pay jump?Maybe you lack experience?(I don't know if you are a new player, sorry).
If you know how to play effectively , knowing ICM plays and how to react accordingly to your stack size then you will auto - piloting and you will enjoy both your winnings and the game!