I was a fairly skinny kid until I turned 6 - I never paid attention to the scales, but was probably over 200 #'s by the time I was 11. I went to a Christian school until I was 13 and the summer before starting in a regular public high school, went on a VERY strict low calorie diet / tons of heavy exercise and started Freshman year around 175. At my lowest weight, I may have been around 165ish (maybe - never weighed myself).
Since Jan 2003 I have lost a little over 40 pounds and personally think I am at my lowest weight in over 15 years (I am 27 now).
It CAN be done!!!!
Best of luck!
Beth