So lost

I'm so lost and I need some help. I'm 12 years old. I have a girlfriend who is 15 that I'm not so sure i have feelings for anymore. And I have feelings for my 18 year old friend that is supposedly like a big sister to me. She has no clue and neither does anyone else(Except for you guys lol) It's nothing big that i'll like die over but i just need an answer so please do get into a think where im only 12 and i shouldn't need help cause im truthfully not in the mood for that. But I just need to know should I tell her? Should I break up with my girlfriend? Should I just let it go for now? What should I do. I'd usually know what to do at something so simple like this but i've been so confused lately and not in the mood to think that hard...I want an answer...not a speech about how im 12..and i shouldn't be thinking of love ok? Just an answer I'd appreciate much. thanks

P.S. Does anyone think its' bad that i like an 18 year old? Like yea its not right a little wrong and can't happen..but still is it bad? lol

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dude take all these feeling and bury them so deep that there never found... shes 18 if she already isn't done high school she will be soon and she leave for college/university. so if you take it any farther it's just gonna hurt SO bad. besides as crapy as it may feel she most likely won't be interestedshe want someonne her own age or older

i agree with Brain King..is that how i spell?..sori

ii think she's way old for you..i mean if u propose the 18 years old girl..than be ready to Cry!!..