Nah dude. You gotta respect your girlfriends wishes on this. Maybe consider getting a place when she’s 18 so she can get away? Will she be moving for university?
If her plan is to keep living with her family and never revealing you, there’s no outcome to that path. But if she is looking to move or study or whatever, you might see a future for the relationship.
Talk to her about the future and where this is going.
Interrupted garden paths. Like stepping stones in lawn. Just put a continual path. Stepping stones are terrible for access and maintenance. Just grass or just paving would be preferable.