I need to break up with her...?

[Not Me]

*I'm in 9th grade* My gf and i started dating two months ago, but she's the clingiest girl ever. Not paranoid, but she's way too dependent on me and I'm worrying. I don't connect to her as much as I thought I did, but she's already planning out our freaking future together and loves me. I'm really coming to not like her at all, but I don't know how to break up with her. Her whole last year has been hell though and apparently I'm the only thing besides her supportive friends that kept her from killing herself. I almost tried to do it before, but then she started texting other friends saying she was close to suicide. Apparently I'm one of her only hopes, and she's too weak to handle me leaving. How do I make her stronger without making her be even more dependent on me? I feel like I'm carrying all of this girl's weight on my back and I hate it. How can I gently get her to become less dependent? And then after working on it for a while and she's okay again, how do I gently break up with her? Please, I hate this relationship.