One more thing, be open about you not having sex before and when she is around act horny, like you want her and not afraid of her. Evene when you're shacking being nervous just kiss her and be pushy, she might just stop you and say hey let's save this for later, but you have to show her that you like her body you know. It doesn't necessarily mean that you'll actually have sex if you attempt to have one, girls just like to see you're wanting to do it with them. And even when you undress her completely if you feel uncomfortable you can say i wanna save the rest for later, the one who really loves you will not be pissed.