Definitely not just you; I know way too many chicks like this who ballooned after high school or during college.  There's just this look about them even when they were healthy BMI, and that kind of shitty extra-toxic attention ho desperately mean personality.  In short, they give off a stank vibe all their own.  I think that whether through work, dorms, barracks, etc., normal humans -- females especially -- who have to live or work with these future-obeasts can smell/feel them coming a mile away and predict their impending hammanity.