this is an extremely good decision that will strenghtnes your faith.
Of course you are nervous. You have to accept you could become nervous and it is expecially this that makes your decision even more worthed. You are renouncing to something that both of you are willing to fdo in the name of something that is higher then your own desire and subjective push to satisfaction. You will gain a lot from this. Much more then you can expect.
Your human relation can suffer but your soul relation will be improved. In front of you I am sure in your marriage will be verry happy moments but also I hope only very few hard times.
Marriage is not just to be happy is to live togher. Sometimes it is easy to do a faulse analogy since for many young or recent couple living togeter is happines.
You are not choosing only to be happy togheter but also to be unhappy and to struggle togheter. This must be extremely clear.
This initial suffering is part of it. But you are togheter this is the most important aspect. You will soon get to the mistery not only of being togheter but of being one flesh.
For what you have done you can condem your weaknes but you can repent and be fogiven by the Lord and by yourself. You will never have the power to do something behond Lord misericordy, if you truly repent.
Never justify yourself, in justification there is no place any more for Lord forgiveness.
And remember if your heart comdems you,as St. John said, the Lord heart’s is bigger then yours. He knows you are not perfect.
My little prayer is with you both