I take it this is about the most important person in your life?
It's hard to endure this kind of emotional torture and not being able to do anything, I know:/
When we are alone in this world no one gets affected by our actions directly, but in this case you are suffering and that is not how it should be.
A girl your age should be smiling every day and wake up longing for what's ahead.
Just a few more years, girlie and then you will be free and able to create your own happy home:)