I have a 25 inch waist. Why do I feel like a whale?

I'm 19, 5'6 133 lbs 34-25-35. Everyone says I'm thin but I'm in the middle of my weight range (114-154 lbs). I feel as if I'd need to lose 10-15 lbs more to be thin. I look at Michelle Dockery on Downton Abbey and wish I could be that skinny ):
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