i can definitely empathize with you!!
older generations of asians don't realize that younger people can take offense or be hurt when called "fat" or whatever. my chinese relatives always say stuff like "oh! you got fatter since the last time i saw you" or "why is your face so dry/red?". apparently, it shows that they care about you, but i'd rather they show concern in a different way. ugh.
if you're feeling stressed about study, exercise does help to relax you. the next time your dad bugs you when you're studying or in the middle of an assignment, try taking a short half-hour break to go biking or on a walk to clear your mind so both parties are pleased (when you have the time of course!).

HUGEEE tl;dr comment, sorry hika ;_;