Difference between anorexia, and just being skinny, what's the difference?

ImStillAnAnimal
Sorry for sounding overally dumb.
But I'm serious.
I overheard a girl in my class speaking with the gymnastics/sports teacher, that she had anaorexia.
Of course I'm not telling anyone!
Anyways, I'm pretty sure that she is underweight, but there is another girl in my class, that is slightly skinnier than her.

The skinnier girl, seems to be more happy, or at least she is when I talk to her.
So why is the happier girl, skinnier?

I've known the anorxic girl for about 7 years (she went to my middle school) and she's always been skinny.

I don't know much about either girl, but the anoroxic girl, doesn't seem to deal with stress, and she doesn't seem self conscous. I may be wrong.

The skinnier girl, doesn't seem to be unhappy or anything, so why is she so skinny?
Difference between anorexia, and just being skinny, what's the difference?
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