About four years ago, I got a strange disease (I called it psychological shadow), that is, I often went to the bank to fill out forms and went to the business hall to sign mobile phone cards.
This is normal. The next time you sign in a crowded place, you find your hand shaking and yell at you. If you tremble again, I'll cut you. If someone questions or asks or calls the police, they can answer by giving themselves a lesson.
Believe me, this is really useful. It is mandatory to improve your adaptability and suppress your inner fears. If you can do this, you will never shake hands.