I found that when it is a little colder, my nervousness will shake, and when it is warmer, my nervousness will drop (I didn't shake). It doesn't shake when it's hot.

What you said is not entirely correct. There are many reasons for shivering, such as nervousness, excitement or intimidation, which can all lead to shivering, or you are overworked and have no rest. If you are addicted to alcohol because of excessive drinking, your nerves will still shake when you are stimulated. If you have Perkins syndrome, you will tremble even more. In your case, cold can also cause shivering. Put on more clothes and keep warm. What you said is not entirely correct. There are many reasons for shivering, such as nervousness, excitement or intimidation, which can all lead to shivering, or you are overworked and have no rest. If you are addicted to alcohol because of excessive drinking, your nerves will still shake when you are stimulated. If you have Perkins syndrome, you will tremble even more. In your case, cold can also cause shivering. Put on more clothes and keep warm.