14 huh? ah, puppy love. yo man, if u told her u like her and she doesn't like you back.. its not easy being "friends." you gotta make your decision man, because I understand wanting to be around her no matter what, but if she doesn't like you and your feelings don't change, it's not gonna work. so IF you truly can be friends with her, which i doubt, then be friends. otherwise, as much as it hurts, u gotta just let her go bro. for her sake and for yours.
then again.. it has only been a week.. so i don't see how that's enough time for her to know she doesn't like you. lol its complicated cuz ur 14 and known her a week.. but normally.. yeah.. being friends isn't easy if u still like her and those types of relationships aren't healthy