While it's "wrong" by society's standards to wish anyone bad karma, I don't think this is "wrong" as much as it is NORMAL. I have fat and skinny friends, and I myself was one of those "always skinny" people during Jr-Hi & Hi-School and through college, too. I was 103-108 in hi-school and 115 in college. I started gaining weight when I got out of college, got a "sit-down" job and slowly stopped exercising.
I am now in my 40's. I am 158 on a good day, 163 on a "pudgy" day (i.e. aunt flo's bloating). My lowest "adult weight" was 126, at 29 years old... when I met my husband. Highest weight was 178 about six years ago.
I have yo-yo'd with 25-30 pounds for the past 13 years. I was 138 last summer before I re-injured my shoulder & had to stop exercising. That was in September, and I was out of the gym for 4 months and gained 22 pounds over the holidays & so-forth. I am currently trying to re-lose the 22 pounds, plus another 6 - this will be the 5th time I have had to lose weight. I am at my best (in my opinion) when I am 128-132 pounds; I am 5'4".
Do I have "fat friends" who USED TO ENVY me? Of course. They even tell me so. And even now, when I'm teetering on 160+ pounds, my 275 pound friend from Jr-Hi, who was 140 IN jr-hi while I was 103, tells me
how she wishes she could "stay skinny" like me!
I guess it's all in how you look at things.
