Random thoughts about love

I was reading an article about love and found this quote:

http://partialobjects.com/2011/07/at-what-age-is-love-real/#comment-5124:
"Taking a step back from the Sophie’s Choice aspect, parents of teenagers are faced with this dilemma on a daily basis: is denying her permission worth the fight, and how long can I keep the parental bluff going before she does what she wants anyway? Differentiation is a constant as well, which at age 17, is probably not complete.
Back to the scenario, there are really four possible outcomes for Romeo and Juliet:
1) Each stays with their respective families (both are still kids)
2) She goes with his family (he’s a kid, she’s grown up)
3) He comes with your family (he’s grown up, she’s TBD)
4) Both leave their respective families and go in search of a third truck (both are grown up)
As her father, I’m interested in one thing only: my daughter’s survival. Is a boyfriend that would rather stay with his family than come ride with mine really capable of putting his life before my daughter’s? Who would you rather your daughter run around with in a post-apocalyptic hell-scape?"

Which makes me think a lot about my current relationship and how it relates in my mind.
My girlfriend is an adult and she still takes her parent's word as gold in some aspects. To the point where I'm starting to worry for her...and my choice to date her. I keep asking myself, "Do I really want to be involved with a girl that is still growing up?"
And the reason I keep asking myself that is because I feel like more of an adult than she is. But why is that? Is that related to finances in anyway? Or is that because I'm just a more independent person, and she's a more dependent person?