Advice?

I'm beginning to take into consideration the possibility that I might be gay. Maybe Bi? It all started 4 years ago in 8th grade when I accidentally touched my friend in a "restricted" area. I've always been considering the possibility of being gay just by the way i act and feel around people the same gender as me. It's always been a nagging question at the back of my head. Now im in 12 th grade and in love with my best friend. As cliche and common as it sounds I'm in love with my best friend. I've been in love with her since last year when I noticed I started liking girls. I'd imagine doing things with her that people usually imagine doing in a relationship. I'm also in a very strict Cristian private school we're being gay isn't acceptable. The worst of it all is my friend doesn't really approve of gay relationships either. Im so confused and scared. I haven't told anybody I'm gay and im very afraid to do so. What should I do?