Nervous. I start a new job soon, it is a completely different industry. How do i calm my nerves?

You calm yourself by sending yourself messages that calm yourself.

I'm not you, so I cannot say what will work for you, but for MYSELF, I would say something like:

"If I am suitable for the job, and the job is suitable for me, then it WILL work out. If it doesn't work out, then it was wrong to start working there, and I will end up someplace that I should be".

Life IS about the reality of the situation. What we want doesn't change whatever the reality is.

We enter a marriage wondering if it will work (at least, if we are realistic, this is how we enter it).

We should enter a job the same way. You do not know how it will turn out to be, and so while you care, you should not be SO invested in how you WANT it to turn out that you become nervous.

If you have any anxiety issues or anything like that just try to calm down by taking a few deep breaths, inhale and exhale. You should also try to have a conversation with yourself in a mirror because that usually helps me with anxiety. Good luck with your first day.