<human>: Can you condense the text into a few key points?

Backstory:  

So me and this girl have known each other for a while now, and I've always sorta had minor feelings for her while she was in and out of her previous relationships (1 long term, one extremely short, hookup-esque.) but respected her being in relationships so sorta pushed them to the side. We've always been close and after she got out of her LTR relationship, people always would always sort of say stuff along the lines of "you two would make such a cute couple", ect. Somewhere along these past few months, she ended up catching feelings for me and we came to the sorta mutual point of that we both have feelings for each other, we should date. Everyone's saying it would happen eventually, goals, ect. Shes happy, I'm happy, great, right?

Wrong. She knows I have never had a girlfriend before, and that I am a virgin, but I don't think she knows to the extent of how little my experience is. My experience stops at hugs and holding hands once or twice, and getting comments on their clamminess.

Its been less then 48 hours and I already feel like I fucked up by not kissing her goodbye, but I was too anxious to in front of a bunch of people, a few of which were her friends. I was in a rush, so i sorta said bye and ran, not my best choice of action there.

I really like her and I don't want to mess anything up. Should I tell her the extent of my experience? Just do it and go for the kiss, tell her its my first after? I've told her that I don't want to disappoint her, and she told me I won't but I feel as if I already have, as she probably expects me to have a least some experience already.
<bot>: First girlfriend, she has a lot of experience and I don't think she knows I have absolutely no experience. Do I tell her? Let her figure it out through me going for it?