Marriage?!

I've been with my bf now for about 10 months. He's the only man I've ever loved (other than family of course), and he recently told me that he wants to marry me someday. It was nice and flattering, but it really freaked me out. I don't know if I feel the same way. I love him to death and k would do anything for him, but it seems a bit early for that. We also have a lot of conflicting views about "adult matters," like how to raise our future kids and where we would do so. We're only 19 years old, and I don't want to get married until I've become an orthodontist, so I have at least 8 years until I want a rock on my finger. I'm not really asking a question, but I'm open for advice.