Will God consider me (female) to be married to my fiancée (male) if we have a ceremony but don’t legally file?

Was there really a marriage license or certificate way back in the New Testament days of the bible? How were marriage ceremonies preformed in the biblical days? Will that be sufficient in Gods eyes if I do the same this day in age?
As of now Im viewed as living in sin. So that is my biggest concern regarding the question I posted. I don’t want to be living in sin .
My religion is Christian.