OK take a deep breath and relax...
I'm gonna sound maternal for a moment, but at your age, you're body is still growing and changing, have you mentioned to your parents or your family doctor that you're depressed about your weight? Have they suggested a diet plan for you?
How tall are you?
I assume that your mom does the cooking in the house? have you talked to her about preparing healthier meals for the family?
What diets have you tried and why did they fail? Why did you get discouraged? too restricting? Not enough progress?
A good healthy diet will have you losing about 2 pounds a week... but you'll see a noticable difference in about 6 - 8 weeks .
OK -- so let's have afood discussion with your mom...
But you can control your snacking- what do you snack on during the day?
then let's talk exercise...
YOu're still in school? DO you want ot play any sports?
You can do simple things like just going for a walk... walk for 30 minutes every day.
{{{{HUG}}}} Just because - don't tell anyone though because i'm kind of a meanie
And just to give you some hope, my baby brother, whos know 38 - was a chubby teenager, probably topped the scales at 300 plus til he was about 16 - then he grew about a foot and started playing lacrosse..and well.. he didn't stay chubby long... my baby brother is now 6'4 - very muscular and has a blonde absolutely gorgeous wife...