I am so sorry about everything you've been through, and are going through. I do not have much advice to offer. I were in the mental health system a long while ago.

I try to help but it always makes things worse - shit really got to me. I know that feeling. For me I talked or called the person or persons I was thinking about and straight on up asked if I helped and if I didn't I'd let them tell me why and it really sorted me out. Ask people around you hoe they got the help they were wanting in the system as well I'm sure there's people around you who must have got in one way or another. A lot of what I think works I know involved socialisation but it just builds a supportive "net" of people for you to fall back on.

Honestly though it's real bad that nothing got done when you were 14 that ain't acceptable. I hope you know that you're not alone and that's a permanent "solution" for a temporary problem.