Insane BMI

I just feel like my BMI is insane.

The highest I can weigh and be in the normal range is 123 pounds. That's the HIGH range of normal!

I weigh 168 pounds and I'm 5 foot. I'm going to be like NOTHING if I get down to 123 pounds..

I mean, I know I need to lose some weight but THAT much?

Does anyone else feel like their BMI isn't realistic ?