I don't know about dropping 100 pounds in 10 months, but there are a lot of peopple trying to drop 100 pounds or more. Many of them post in the Triple Digits Club, which is about halfway down the main page of the forum. 100 pounds in 10 months is very fast, but you're young so it may be doable. I'm about twice as old as you are and it took me 17 months to lose 100 pounds.