Keep taking things slow!!! Youre 17 and unexperienced-you just went to prom...
Your g/f is on an emotional high right now. So dont take advantage of that-prom does something to girls. Wait a few weeks before going any further with her. If you really like her then she'll let you know if she wants to try other things. I mean you can always kiss her but if you want to roam around-stay on the outside. That will give her the chance to either allow you to or she'l ask you to stop. Then take it from there.
But I would suggest keeping at the pace youre at right now. Just exchanging the I love yous is a big thing-and at prom. What is it with Prom night anyway? Some social damn thing where it becomes a huge declaration for everyone? I did it-the I love you toos! But-within a few weeks that so called magic that night just kinda faded.
Anyhoo-so my thought-dont go fast for awhile-you guys are doing fine at the moment...
Hey what was your theme???
everything happens for a reason...beginning to wonder why.