hey, guys. so, i've had this thought troubling me for a long time. ever since i've cared for my weight, i've starved my body to an extent where i would have a flat stomach. now, my bmi is already 18.1 (underweight) from a 28 bmi, and i still don't exactly have a flat stomach. yes, my stomach has decreased its size considerably from last year, but i still have a small bump of fat, protruding on the lower, belly side. my arms and whole, lower legs, specifically, have always been thin or even medium in size at most. no matter how much i've gained, i never had them to an extent where i couldn't wrap my my fingers around its wrists. however, now that my bmi is 18.1, my arms and legs have gotten so thin that even if i used my little finger and thumb to wrap my wrist, there will still be an allowance. likewise, i could wrap my fingers around my ankles. i hate it, because people in my school would always comment about how much i got so thin and act so surprised, but i can see that what they're really thinking is that i've gotten TOO thin and think i'm anorexic. that's also another thing i don't understand because i know i've been very preoccupied with calories and even just gaining a pound but never have i come to an extend where i would force myself to vomit the food i ate, thinking that i could remove all the calories i just had consumed. anyway, my stomach maybe be called flat by people but in my literal point of view, it isn't. also, when i eat--even with just a a plain, small cup of rice, my stomach will bloat eventually. i don't get my body. it just looks like that the only part of my body that gets fat is my stomach. until now, i can't wear any xxs tight, shirts without filling my stomach with simply water. i'm trying gain a little weight just to fatten my arms and legs but still, no avail. only my stomach gets bloated. i exercise but not muscle-building ones, because i don't want to keep a regular exercise routine just to maintain my muscles. no matter how much i do stomach exercises, like crunches, sit-ups, etc. it still has that small, belly flab. does anybody have any suggestions or infos to share, regarding my problem? thank you