Romeo and Juliet? (Without the death part)

I’m 18 and on tomorrow is my first anniversary with my boyfriend. But before Thanksgiving break my parents found out I’ve had sex with him. They went nuts and I’m on full lockdown. They don’t want me to be with him. I just really wish to see him. I miss him so much😔. How can I make my parents understand that I’m almost an adult and they don’t have to meddle in my sex life?