Bi-sexuality? Help please!?

[Alex]

Well, basicly for quite a while now, since something triggered it off, i've began to think i am bisexual. Well, thats how it started off, when i was attracted to a famous women ( not going to say who ) and i mean like really attracted to her. Then, i began to think of women/girls in a different way ( by the way i am a 15 year old girl, almost 16 ) so yeah i look at girls in a different way and i have completly gone of boys. When i was growing up i used to do things with a close friend of mine (girl) and i used to feel every now and then feelings towards girls and i would get worried what was going on, i was too young to really understand. But ive always felt like..different, in that way, and i think now, i have figured out why. As i said, i have completly gone off boys, they make me feel sick, and when i think of being bisexual, it makes me feel happy like, being bi means i can be with girls.. obviously because i like girls.. if that makes sense. But i sort of feel like, im never going to know for sure, i mean, i know i am bi, as far as my mind goes, since ive never had any sexual relations with girls, i sort of feel like, im never going to know unless i do, and thats hard. So, what do you think?