I ALWAYS felt fat.
From as long as I can remember, from as long as I've had a consciousness about what "fat" means, I've been "fat."
In my case I know where a lot of it comes from. My family was full of fat-haters. My best friend was petite. Our pop culture icons are all objectively underweight.
I was NOT really overweight until I was in my late 20s. From the time I was 12 to the time I was 20, I weighed between 120 and 150 pounds, with an average weight of 135-140. This is all "normal" and I would be so happy to be that size again. However, my parents, brother and grandmother were constantly telling me how big I was. Add to that the fact that my high school bf was abnormally skinny (in part due to drugs) and that accentuated my perceived fatness.
Now that I'm objectively FAT (or at least rubenesque) I feel like I don't have a good perception of how I really look. If a guy (who is not a chubby chaser) is attracted to me I'm perplexed. Doesn't he see that I'm FAT? But I have no idea how fat I actually look.
For you country music fans, I think I'm somewhere around Trisha Yearwood's size and shape circa 2005
I remember the Carson Kressley show where he takes cheesecake photos of chubby gals. I know a lot of them have these sort of perception issues as well.
It makes it hard to know when you're a good "healthy" weight because nothing seems to look or feel right.