Application for my dream job

The company I would like to work with is opening a new job, the one I dream of.
I have sent my application (resume and letter), and I am now waiting for an answer and to continue the recruitment process.
I want this job so much that I create pressure and stress for myself, and I know a lot of candidates are applying for this job.
I continue to prepare myself for the next steps but my thoughts are pessimistic, I anticipate the worst scenario and I am afraid not to get this job. I know all those thoughts generate pressure and stress, and create my result : I am not in the best conditions to succeed this recruitment process.
So I feel guilty, not to be ready for this wonderful opportunity.
I would like to regain power and strength but pressure is stronger.
Thank you for your help.