Is 93 pounds underweight for a 5’6 woman?

I am 18 years old. I am a bit over 5’6, but I’m only 93 pounds or so. I weighed even less a year ago.
I’m not sure if this is considered unhealthily underweight or not, but I’m worried.

For example, my waist is only at 22 inches.

Is 93 pounds underweight for a 5’6 woman?
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