There’s nothing to be nervous about – yes, this is a new chapter in life, one that you have zero experience with, but you know that marriage will be good for you, and you know that you enjoy being with this person. You don’t have to know that life will be perfect, because it won’t. But you can be proud of the decision that you made, and you should realize that you and she are capable of working through any situation that may arise. I’m not such a big believer in the whole bashert thing – whether it’s true or not, I think that line of reasoning is counterproductive, and I believe that as long two people WANT to live happy, productive lives together, they will.
Hatzlacha rabba, and mazel tov!!