how do i tell my friend im bi?

[always too nice]

she is a christian and has a bisexual friend who has a girlfriend and shes okay with it.

but ive known her for three years almost four and weve been through so much. like sleeping in the same bed, changing clothes in the same dressing room and like shaving our legs together. i dont want her to think that like im "checking her out" or have a crush on her or anything.

i just want to know how to tell her. every time i go to tell her i chicken out or dont know HOW to say it. i dnt want to put a dent in our friendship or whatever. it means so much to me.