I'm not sure if I'm bi...? PLEASE HELP!!?

So, Im a teenage girl, and I notice I get attracted to some females and sometimes fanatasize about being with my female friends, but I dont think being bi is right, I dont mind when other people are, but I just feel strange declaring it myself. So, have you ever been attracted to the same sex, does it just mean your affectionate for others or hyper sexual, Im not sure what to think about this? Thanks in advance