Marriage/Advice

I’m 17 about to turn 18 and my fiancée is 19. My parents met him in December and told my family that we’re not dating and he won’t be a part of this family. We’ve been dating behind their back since then. Has anyone

1. Went behind their parents back and gotten married?

2. Gotten married young (before 20)?

3. Completely or mostly stopped talking to their parents?

4. Knowingly married someone their parents didn’t like?

How did these turn out? Thanks so much!!!