How to get really skinny fast?

im 11 and i am severly overweight 154 actually and i want to be really skinny before i go back to school after summer. i want to be atleast 75 pounds by august 3rd so that about 1 and 1/2 months.And please nobody tell me thats dangerous or whatever. I have already tried starving myself but i only gain weight.infact i went to the park and walked a mile 3 times in one week and gained 5 pounds??? i need help please tell me a diet i can use or a way to loose weight fast and please dont go copy and paste from some web page you googled that uses giant words that nobody understands or wants to read.plus i am not allowed to go outside and play/get exersise much but i might get i bike soon.and if i cant loose that much that fast how much can i and how?