Marriage

Hello ok ever since my parents found out that my fiancé and I did it they've been really mean and don't trust us together, and we just want to get married but our wedding isn't until next year. What do you think we should do? I know we should of waited until we were married because that's what we believe but it's sex it's hard to not want that you know? We love each other so much, we can afford it it's just I know they won't want us to but I'm 20 years old what should we do?