I don't know how to move on? Please read!?

I really like this girl, btw. I am a girl. She is gay & im not sure what I am . I like girls but not guys but she keeps saying she doesnt think im truly gay... so idk . anyway , we had a sleep over last weekend, and we kissed & we cuddled & we had the sweetest, cutest night ever . and she is single, im single & she was tellling me everything she likes about me . and i told her everything i like about her & she asked me if i think her and i could work out . i said if we wanted it to yes . she said we need to talk about it. so when i go to talk about it, she basically already knew the outcome of , no we wont work out . what was the point in her asking ?

she told me her reasons were that, we come from two different worlds. my world is structured as oposed to her. and she doesnt want to be a bad influence on me because she smokes and drinks and i dont .. but i dont care if she doesnt . im not influenced by anyone . and she wants a girl that she can smoke/drink with & shes done things ive never done before ... & that im too innocent .

another reason was that she thinks im really into this guy & im not . by any means im not . i really really like her & i want to be with her . its so sad .

I just dont see the point in anything. Why did anything happen then if she knew we would end up like this ? & now i feel so awkward around her , and i dont like that feeling . i love being around her , even as friends ... and its so hard . we went to a party last night ,we hardly even spoke , she looked so damn beautiful and it killed me to watch her have a good time while i was hurting :(

Last year my best friend fell in love with her, and she always held her feelings back & was so mean to my best friend, and finally when my best friend got over her & found a new girlfriend, she confessed her love to her, and it was too late. now my best friend has dated quite a few girls after falling out of love with the girl, she currently has a girlfriend , and the girl i like , i think she still has feelings for my best friend, who is also her best friend , and it sucks :(

i have done nothing wrong , im just not "right" for her .. but i want it so bad . i dont want to move on but i know i have to , right ? I just dont know how ..

all answers would be great. thanks .