@alacano,
I would say 'stick to your own opinion'.
I'm old, but I remember. When I was thirteen in the last year at a catholic school, via rumor, the whole large class was fooling around. (I'll take it as a third of the class). Then we moved, and I didn't even know any boys, going to a girls' school, so I missed being aware of normal progressing by others. But, your girlfriend seems normal to me now, and truthful.
I'm not a guy, despite my username.