Nothing really wrong with it dude, but if you want to be on the safe side just wait till she's 18. You said yourself she'll be 18 soon so you could at least wait till then, in the mean time get to know her more as a person, what she likes to do, things like that, there's nothing wrong with just talking. You don't want something like this to come back and bit you in the a$$ later, especially if you get her upset or something she could turn it around on you. Hang in there, wait it out.