To be honest, if you keep it to yourself then i doubt anyone is going to notice.
If the guy you marry is a virgin, and even if he's not, He's a guy, he's not going to know the difference. People make a much bigger deal about virginity than it really is.
It's always great to have your first time with someone you care about but if not then it's really not a huge deal. What's happened has happened.
If you're the sort of person who will feel like you're hiding a skeleton in your closet keeping it a secret, then maybe it is best if you tell you're parents.
But at the end of the day if your future fiance loves you then it really shouldn't be a big deal. Everybody makes mistakes, and they help to make you who you are.
hope it works out for you, georgie xxx