Providers never want to get into explicit things over email/text, as it leaves a trail of info that could be used against her and is just kinda plain stupid. Over time this might get relaxed if she gets to know you, but at this point she knows nothing about you, other than info you have supplied and that she can verify and Google. Same thing with you and her, which you have experienced.
You can just say..."Hi, I am in a unique situation because I am not only new to this, but I am very inexperienced. In fact, I am a virgin. I wanted to disclose this because I know this is probably a unique situation, and I wanted to make sure that you were comfortable with this."
That's all you need to say. You don't need to go into explicit details or anything else other than what I just said.