How skinny is actually skinny?

I always get told I'm skinny but for some reason I have never felt that way about myself.

I'm a size 0-2. (U. S.)
And a size 4 (uk)

And a size XS-S (in all clothing stores)

And when I buy clothes for my age, because i still can. Because I am young enough. :p I buy clothes that say '14 super skinny'

I'm 99 lbs, 7.285 stone, 45 kg. And 5'2", 1.58 m, and 157 cm.
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+1 y
I'm not fishing for compleiments.
? :(
How skinny is actually skinny?
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