Im sorta freaking out?! 14 years old, diabetes, severely obese?! HELP 10 POINTS?

ok ive been fat for a while but i was never huge but i am now. i was 170 pounds or so in 2007. then i started eating a lot and now im 220 POUNDS!!! i have stretch marks all over and im afraid i have diabetes. i mean im not thirsty all the time but now im freaking out cuz my doctor says i should be about 170. i would sneak in the pantry and eat pop tarts and muffins and stuff without even thinking! i feel bad about it now though!!! i asked my dad for a blood sugar test but he ran out of strips for his little machine! PLEASE HELP SOMEHOW!!!!!