How to make the relationship deeper?

Im disclosing with we’re both teenagers so we’re still young and she’s grounded like hella badly so we sneak out to my other friends houses and do stuff there, but i feel like in the rush of sneaking out and how intimate we are i haven’t gotten a chance to know her like i should it just feels so awkward turning this relationship that’s kinda secretive and stuff upside down into a real thing but i really need help getting into deep conversation because i’m scared i’m losing her interest by not knowing her we’re going on our first real date after months of this and i don’t know how i’ll open up a conversation like that to her any advice on making a relationship less than surface level?