I had always been really small.
I graduated high school at 17, 5'10 and weighed less than 120 lbs. I was very underweight, and felt like that's where I was supposed to be to be beautiful. I had always had a problem gaining weight, and kept it down even more to keep this image that I thought was pretty. As I got older, I gained weight due to a health issue, and after having some of it resolved, I weigh a comfortable 140 lbs. I now see that I don't need to be unhealthily small to be beautiful, and that being healthy is prettier than being sickly looking. Size doesn't matter as long as it's healthy, and all women are beautiful!