I remember feeling the EXACT same way, sweetie. I too was a virgin when I got married, and I was scared to death. I was so naive - I'd never seen a man naked! I didn't have any brothers either.
Unfortunately my new husband was NOt a virgin, so he wasn't at "patient" as I would have liked him to be. LOL It was "ok" but not quite what I had hoped. LOL
Just make sure your new husband is very slow and patient with you, and you'll be just fine. It will be a great, loving experience that shows each other how much you love one another. You are "as one." So don't worry -- it will come naturally my friend. I promise. God bless you and please take care. Hugs, Lee