I can't stop crying.?

I had to go to family therapy for the first time today and I hate it. I cried through the whole thing..My parents and therapist think its best for me to be an inpatient at an eating disorders clinic. Yes I'm 14 5"4 and 78 pounds but I don't have an eating disorder. Also I have made my self sick but its not like I do it every day. My parents also brought my pro-ana journal and showed it to my therapist and also told her what sites I went on and where I posted my videos. I fell asleep with my laptop+journal that's why they have it. How do I convince them I am fine and I don't need help? And don't say "eat" because I do eat but no more than 200 calories if I even decide to eat that day. One more thing. My stupid therapist told me to write down how this all started,how I feel everday,how I feel about food,what I like about myself,etc,etc,etc..do you think if I wrote about how I like food and put down I eat a lot ..would I have a good chance not going to a clinic?