You shouldn't have to feel guilty for having your very valid feelings. I hope she isn't using this to keep you like threatening to self harm if you leave. Is there anyone in her family you can tell before you tell her? Like could you go to her mom or dad and say you are scared she will harm herself and have someone in the family keep an eye on her? I understand the guilty feeling. I have struggled trying to break up with someone for fear that they would just be so devastated. It feels really good when they find someone else and are happy because it takes that guilt away. But in the end it's what will make you happy. I hope you can remain friends but I also hope you are not hurt if she cannot be friends with you after this. But being with her when you don't feel the way she wants you to is not fair to her either. The best thing for both of you is to break it off. I hope you can find a way to break it to her.