could I be BI?

I am a girl but I only like certain types of girls but I also like boys too and I shouldn't be BI because I am a christian and my mom said that girls should only be with male and not female but I am wondering now and I am 11 years old BTW and I don't know how I should really feel now. I feel confused but also kinda good because as BI, I still like boys but I feel like I like a certain type of girls too. I don't want to offend BI people by just think I am BI for no reason or just for attention but could these things be a sign? did you have this experience too?