How do I come out to my friends ??

I know I’m bisexual and I have all girl friends and am a girl but I don’t like them in that way and I’m scared they won’t want to have sleepovers with me or anything please give me advice I’m 13 btw and I want to be able to tell them and I feel like just screaming it out not planning to tell my parents till I’m wayyyy older like over eighteen cause then it’ll make more sense idk I just feel like if they’re talking about boys or whatever I can talk about boys and girls and not have to hide it anymore