*hugs*
you CAN get out of this. you aren't totally trapped. I know it feels like you are, but what you have to do now is look at what you can do. I know you hate talking about this issue at all, and that it will be hard to deal with your therapist now.

There's nothing you can do about your parents knowing, but there IS something you can do about how you react to THEIR reaction.

They say you let them down, and were angry at hiding it from them. But you're 18, they feel that you need to tell them stuff because they're your parents but, really, you don't have to. They were shocked, they were... being typical parents. their reaction doesn't make you bad at all.

Next time you meet with your therapist talk about how you felt to have your parents know all this.

To be honest, you're NOT safe. You can be a danger to yourself. And that needs to change. You know that. But that doesn't mean life stops, life keeps going. People who haven't experienced si doesn't always understand - and they don't know how to deal with it. Your parents want to protect you - they just don't know how to protect you from yourself. The best way you can make them get off your back, is to start getting better... that's your priority now. Not getting away from your parents, not feeling happy, not getting your grades up, not hanging with your friends (although all these things relate to it). your NUMBER ONE PRIORITY = feel better, get better, get safe, and keep going in that direction. That doesnt happen right away. But do your best to start

sending loads of hugs
thinking of you
~turquoisesea