http://www.nhlbisupport.com/bmi/A lot of people may be at normal weight or even below normal weight and still not match someone's notion of an ideal figure. I was undeerweight in high school, but very large boned (seriously! I'm 5' 1 3/4" tall, but my wrist measures at 6 3/4":
http://www.nlm.nih.gov/medlineplus/ency/imagepages/17182.htm) Think hobbit as opposed to elf! Here's a link to help you match frame size to optimal weight:
http://www.nlm.nih.gov/medlineplus/ency/imagepages/17182.htmI still have the same frame I had in high school, but I can't blame it for how I look now. Now I'm just plain too heavy. I wish I'd appreciated my body size back then!