Help...

Okay...So, I've been trying to loose weight for just over a year now and I've only managed to loose a stone and thankfully I've been able to keep it off.
I'm 15, 5 "7 and a 1/2 and I weigh 9 st. 8.
My best friend is on similar lines as me with weight but she's is quite a bit larger than me.
In the past few months she has dropped two dress sizes and whenever I ask her how she does it, she says I at less fattening stuff, eat mainly low fat and low cal stuff, three meals a day and exercise in my aunts garage ('cause she has weights and a treadmill). She's also told me she stops eating a few days in a week.
But no matter how hard I try I can't seem to get my parents off my back. Hate to admit it, but they are fat.
I eat one meal a day (forced), my mother keeps on saying eat healthier then will give me something and then tell me some crap to try and tell me it's healthy, whereas my father will shove something fat infested in my face and tell me "Eat!" because "I'm too thin."

I finally managed to get my mother to listen to me the other night to tell her 'I want her to help me to loose weight.'
She replied, 'She would give me things like salad and fruit more often and stop buying things that I say I won't eat.' (Well, at least she's starting to understand..)

I go to the hospital once a month (which I absolutely hate!!!) to see Dr. Hart, because for the past three years I've had abdominal pains, which the more I visit the more they think I have Irritable Bawl Syndrome, (search on Google) which is 'caused by stress and mostly reacts with fats.
So that keeps the fats away:)
The Doctor has seen my scars and they have sent a letter of referral to a therapist for me to see about it. Little do most people around know about me and my everyday life anymore. The Doctor has also laughingly told me that if I lose much more weight then I am in chance of having an eating disorder!-____-

HA. HA. HA.

I need help with how to get around eating without my parents knowing...I need some thinspo, ANY INFORMATION IS GREATLY APPRECIATED!