I am so disappointed and disgusted with myself and the state I am in. I am 5'6.5 and 180 lbs and size 16 (12 stone 12, 81.6 kg) 
I am borderline obese and I want to do something about it, I'm just turned 20 and I don't want to spend my youth fat.
But after some comments from my mother, I want to ask can someone be too fat to lose weight?
Also what is a reasonable time frame to lose 3 stone. 6 months?