Would it be healthy for me to try to get down to a size 3 or 4

I'm 16 5'11 148 pounds I really wanna lose like 20 or 30 pounds. I'm look skinny but I'm kinda semi thick in my butt. I'm a size 9 in shorts and like a 9 or 11 in jeans. Will I look sick or still healthy if I try? Thx I wanna lose it by the end of summer. People say oh you should model so I kinda want that body.
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+1 y
And I'm like 34b in my chest forgot that.
Would it be healthy for me to try to get down to a size 3 or 4
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