When will I stop wanting to die?

I'm fifteen years old, and a major chemical imbalance makes me despise my life. I am taking an anti-depressant and an assistant but am still depressed. I've been wanting to die since I was 7 years old. I'm giving you the details so you can answer efficiently, not so you can hear my sob story. I've tried to commit suicide four times, and my mother knows about all the times. When will she finally send me away? I want to get away so bad, I'm on the verge of running away. It got so bad I took 8 tabs of 150 mg trazodone. I want to know when I'll feel good again. I also want to know when I'll be able to leave, and where I could go. It's alot to ask, but it's necessary... Thanks.