Married at 16

I recently got married to the best guy and we've known each other since I was 5 and he was 10. Our parents arranged us to be married before we moved to America. Though my parents told me if I ever felt like he wasn't right I didn't have to marry I chose to because it is my culture and I truly love him. Being in high school and being married is kind of tough and now he wants to have children but that's something that I am not ready for. We have been married for 7 months now and I am still a virgin and he is willing to wait until I am ready but it seems as if he really wants kids now and I don't exactly know how to tell him I'm still not ready.