I'm crazy about a girl...

I’ve just become very close friends with a girl who I’ve known for about a yr, and I’ve realised that, as she has been away on holiday for ages, that I care for her more than in a friendship way..like, I would probably go out with her given the chance. The fact I’m bisexual is such a huge thing, its really hard to keep this secret from people, bt I physically dont feel I can tell people..like im about to, and I stop, and I CANT do it, because I know it wood change my whole relationship with them..(gays and bi people arent looked well upon in my school- they arent picked on or anything, but its just the little things, like strange looks from people, comments..”she said she was bi..” “really! surely not HER..?”). My first question is- are there any ways/ tips to tell people, and are there any gd methods? If anyone has any personal experience, what sort of reactions did you get? secondly, I dont want to ruin a gd relationship with my friend..r there any signs I shood look out for to see if she is interested, and what approach wood you recommend to take? like, shood I make it known im bi, or shood I keep it quiet so as not to freak her out. HELP ME lol