Losing A Lot Of Weight ...............?

I'm a 15 year old guy and i weigh 227 pounds (103 kg). i''m about 5'10 or 5'11, not sure. at school people don't really make fun of me or anything, but that doesn't mean it don't happen. i feel embarrassed when changing for practical P.D.H.P.E in front of the other guys. i always make excuses to get out of school things, like athletics carnivals, swimming carnival and cross country. i'm not very social out of school, and don't get out of the house at all really.i play the xbox a fair bit and watch tv a bit too.i wouldn't even go to my friends birthday party because they where going to use the pool .i need and want to lose weight bad. i want to lose about 100 pounds really fast, maybe 2 in months or in the least amount of time possible. i eat a lot of junk food and drink a lot of soft drink, which i think i can cut down on with some effort. I need to know a good diet plan that's fast and easy, and any tips on the eating would also be great. If no good advice I plan to exercise in cardio and light weight lifting regularly along with eating less and eating heathlier. If this is not a good plan please tell me another, and if it is how fast do you think i can lose it? i'm only 15 so its unlikely i can get any supplements/shakes and stuff like that. i also have bad stretch marks, an tips of those would be good. i want to know if there is any foods i should stay away from. please help me, if you have used a good diet before that worked, can u tell me. i need to change my lifestyle to a healthly one don't i.Losing A Lot Of Weight ...............?
Do it scientifically. You can't lose 100pounds in 2 months but you could probably lose 25.

Scroll down here http://calculators.hpathy.com/calories-n and you will find a calorie intake calculator. It will tell you how much you need to eat to lose weight.

Then use nutrition info on food packaging and go to nutritiondata.com and you'll find how many calories each food contains.