:Like acidic mom has said be confident. You have to believe in yourself to get this. Try asking her questions about homework or something ,if your in the same classes. Girls love to talk so ask her questions but don't over do it . get to know her. Most people say that the friend zone is not the place to be but it is you then have the confidence to talk to her. Step two flirt most guy girl friends flirt just for fun but flirt a little and if she says thank you or something like she doesn't take seriously look into her eyes and say you know your beautiful right or you know how i feel about you right and if she says no i don't or were just friends then lay off and give her signs get her thinking and then after a while go up to her and say the truth tell her she's smart , pretty or whatever it's all the same and ask her out it takes a while but it assures no heart break I am in 7th grade and I have invented this skill and it works trust me. I know how you feel around her just put your feelings aside and just be polite (girls like the guy that holds the door for them). this is my long list of advice that i can assure you will work.
The key to getting a girlfriend in the 7th grade is confidence. You need to remember to believe in yourself and stay cool. Don't worry about following the crowd. You should be yourself and keep a good sense of humor.