Some Tips To Help Calm Your Nerves Before Your First Time Having ?

Hey I'm 15 years old and me and my girlfriend are planning to have . Yes I know some people will say I'm to young (but please try and respect my decision). We have gone through all the other stuff that leads up to so were not just going strait for . We have talked about it a little in the ped 4 months but this ped month we really have talked about it lots. I being the guy have taken the responsibility of going out and buying condoms and lubricant and all that jazz. And were trying to plan a day to have it. We both are nervous, scared, and excited at the same time. So if anyone has some tips on how to help calm down the nerves that would be great!