How do I loose weight healthily and fast?

I'm not fat or anything. I'm already one of the skinniest girls in my class. And I'm usually the skinniest out of all my freinds.

I just want to be a little skinnier. Like 5 lbs skinnier.

And I'm 99 right now at 5'2"

How do I start eating healthy? Because I have never done that in my life.
How do I loose weight healthily and fast?
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