un-healthily underweight

I wonder if it's too absurd to claim that I have a high metabolic rate. Well, it will be 'cause I'm rather lazy, and have been sitting on my butt mostly and I don't think much.. I think. In any case, I wonder that. Because I've been snacking like nobody's business (except mine) throughout the exam period, and from the time since the exams ended 'til now, and I've definitely been in a state of inactivity. Unless you count travelling on public transport as a worthwhile calorie-burning activity. (Well, lindy and tap occassionally too..) And after all that, when I finally had the courage, and opportunity, to step on the weight-scale, I'm still at 41 kg. Well of course, that was as of the moment at approx. 11.45pm 18th May. I could have been.. lighter, though I highly doubt it. I eat alot in school, full meals, because I will not and must not allow my stomach to make noises in lessons. And I don't exercise, in terms of PE-type of exercises like back in JC or sec sch. At the most, I do some lindy-hopping. Which is some exercise, but not that much.. or is it? Point is, I expected an all-time high like... perhaps 43. Before this, highest record known to me, was 41.5, after returning from China. The generous hospitality of the locals there, plus Aunty Nancy's culinary skills, it was expected.
So, 41 now. That's good, in a way. But of course, they say weight doesn't necessarily equal mass. I'm a science student, but I never really fully comprehended that weight-not-equals-mass thing, although I've a blurry explanation in my mind. Weight is due to gravity, and mass is, well, what you're made up of. But STILL.. Nevertheless, 41 now, but I still feel more flabby than I was in the past. I'm not saying I'm fat ('cause if I did, I know there'd be some who would be quick to plan and carry out my assassination). I'm just saying I feel unhealthy. I feel like my arteries are clogging up. I'm underweight, I think, but I should at least be healthily underweight. I know, it's contradicting, healthily underweight, but I'll still insist on that.

Of course, I'm a lazy little bum. Darn.