Any good ways to measure my body fat percentage without going to a specialist?

I am pretty low on the body fat, but i want to get abs,s o i need like 8% body fat. Is there any EXACT way to get my Body Fat Percent? I went on an estimation website and put in my measurements, and it said my body fat percent is 11.87% HELP!
My waist in inches is 29 inches, my neck is 15, my weight is 136.2 pounds, i am 14, and i am a Male, of course…

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