I WANT HER SOO BADLY.. I NEED HER?? I'M 15 THIS summer!!help?

I dont see what the problem is. If you are already talking with her (even if its just over the phone), then just keep doin that. Your relationship wont change to becoming a sister to her or to you in one day. So keep talking to her, keep asking for advice, and if she comes to you asking for help, be the same friendly person she is with you. and in time you two will feel like sisters to each other. Every teenager needs that kind of figure to help them. Im 17 and for the past 5 years i had one who is like a brother to me and he is extremely older then me. So just keep talking to her, sharing your thoughts, your problems, and basicly everything sisters should b talkin about. And in time you two will have a very strong relationship (as if you two were sisters)