I agree with Boomer. At 16 you shouldn't be taking crap like Hydroxycut, and you have a lot of growing to do still, so the flabby pecs will probably go away eventually. Never depend on supplements. Adjust your diet and workout routine, and only use the supps to fill in the gaps. When you diet, you're usually missing out on vitamins, minerals, etc. So, I suggest you take a multivitamin as your only supplement. The rest depends on your diet/routine.
Good call on the green tea. My girlfriend drinks it all the time and I drink hers just to piss her off. I guess it was good for me.