I am 13 (male) 5 foot and 332 pounds. i wanna lose weight any tips how?

i have been fat my whole life and so far i have loved it until now. i just want to lose all the extra weight. i read what all u had to say from my (weight gain question). so i will stride to loose weight and live longer. i need help iwant to lose the weight be fore i get obesity related conditon(heart falurie,diebates high blod pressure etc.) . i have been on every diet in the past (not of my wanting). and months later i regain the weight so i need youur help. My family can't aforde surgery so i need help. then i can be a healthy the remander of my life. not some sack of lard for the remander of a short life. please i am on my knees. just help answer my Question and give me a life worth liveing