hey, I'm 14 and have this same problem alot of the time I know this was poestd a while ago, but I generally think you should tell her, but reassure her that you don't want it to affect your friendship with her I end up doing that most of the time, and it lifts so many smothering feelings and your friend should be okay with it. if your sure she's straight, encourage her to tell you if she's uncomfortable with anything email me and tell me how you go. hope I helped x