Please help me, im confused about my uality.?

alright, im confused about my uality. for about a year ive been ually,mentally, attracted to my same , females. For instants girls in my school can think of like what they call super hot celebrity guys for example hm-mm... Zach Efron, Chris Brown, or like Neyo. and ill just think in my mind ew..males. I don't even care if its the iest man alive i still don't find them attractive. And i live with my three brothers and i think maybe living with boys has gotten me into girls cause that's all they talk about is there girl friends. And also every now in than my friends will call me and be like "oh my gosh you need to come over here there are hot guys!" i think to myself ill only go if theres cute girls. Well what do you think? are these the signs of being a ? how should i adress this to my friends? oh and by the way im in seventh grade and some people would say its just a phase. is it a phase? please help thanks :]