Stop thinking about it too much. guys are not the one who decides whether or not you are in a relationship. It's always the female. Get physical with her, kiss her when the time is right and let her figure out all the details. You are young, and there will be a plenty of heart breaks and issue ahead of you.
Like what I said to my close friends, and I will said it here too. try it out, get physical, don't ask her if she wants to be your girlfriend. Let the girls to wonder and think. Men are suppose to act, and be manly about what you want. Yes it is a little sterotype, but that's how the world operates. until you have realized what's going on. you are far from growing up and ready for a long lasting relationship.