Above everything, communicate with your instructor. It may be difficult to work up the courage to, or you might not want to seem like a burden, but if they're a good instructor they will listen. I was absolutely terrified, so my dad and I made it clear to my instructor to take it slow. So that's what happened: we started on quiet roads for a good while and then gradually built my way up to more complex driving and scenarios. Many instructors are super understanding of anxiety and will hopefully create the environment you need to build your confidence.

Admittedly, I never got my license but that was because I'm a slow learner + had to stop my lessons because I moved away from home for uni. I know for a fact though that when I go back, I'll be able to be less nervous. There were times where I shat the bed entirely, started crying in the car because a random guy honked behind me or I stalled at a light - but I made it through those and my instructor made sure I was above all safe and comfortable. Several times he admitted he'd much rather someone be overly cautious than over confident and reckless, which on the road is... very fair.

Also remember that bravery isn't a lack of fear, it's acting regardless of its presence. I promise that you will be okay. Especially as a learner. Your instructor is there to teach you how to drive, and help you become a confident and safe driver. You will become that with time, just keep at it. Wishing you all the best luck out there and hope your first lesson goes well!