thin or thinner

i wonder if i'm getting myself too thin - with all the low-carb dieting, the hydroxycut i started drinking (which makes me super agitated, kinda palpitating feeling) and the short cardio exercises i've been doing. when i bought the hydroxycut the other day, the guy asked me if it was for me and i could see it in his eyes he was thinking "is this guy for real?" i guess he thought i was anorexic or something hahaha! actually, i just want to weigh around 165lbs and depending on which weighing scale, i am right now at 170lbs (at home) or 174lbs (at the gym). add to the trimming down is i also want to burn most of my fats (hahaha). blame it on my friends who calls me "fatty!" but for the record, i am not anorexic - i just have goals.