How should i ask her if she likes me?

im a 7th grader and i like this girl but i dont know if she likes me.i go to a small school,VERY SMALL. so im afraid if i ask her and get rejected the whole school will know and it will be imposible to get someone else.but i want her and no one else she says hi to me in a really perky voice every time she sees me,wich sounds like nothing,but she only says hi to me and she is always in a good mood around me,so i dont know if she likes me. im thinking about going to her best friend and talk to her and tell her to tell the girl i like that i like her. i will say if she does like me tell her to call me and i will give the girls best friend my number,if i get the call im in, what do u think does the girl like me?