How do you handle pressure in the project?

Hello, I have around 1.2 YOE in software engineering. I have been working on the biggest project in my org, and to deliver MVP, we are giving everything, and sometimes I feel too much pressure and get overwhelmed and wish I should never be a part of this. Sometimes, i can not even sleep and think only about work and project in the sleep. Is it normal? Seniors around me are very chill and handle every situation very calmly. I don't know if I would ever be so chill and calm or if it would be fine time by time while getting more experience in this field. If you ever feel this is relatable, how do you handle this kind of situation?