Oh, Girl...

You come to me with
scars on your wrist
You tell me this will be the last night
feelin' like this

I just came to say good bye
Didn't want you to see me cry
I'm fine

More song quotes, this time from Skillet's "The Last Night". Before anyone jumps to conclusions, the title comes from the line, "This is the last night you'll spend alone".
You're having a hard time. I just can't understand how your parents and therapist can be so blind. Interestingly, though, "The Last Night" goes into that too:

Your parents say
everything is your fault
But they don't know you like I know you
They don't know you at all

It's true. If they knew you, if they cared about you, they wouldn't do this to you.
Keep fighting. That may seem cold, but it's all I can think to say. There's a light in the darkness if you can just find it. That was the point of the first poem I ever posted on PC, and I stand by it.
Stay safe...