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I'm 6'1 170lbs and I ride 180s 50/50 all mountain/park and I find them perfect size. Also have my 171s park specific skis that I find a ton easier to manuever.
180 was pretty managable for my build though, I just find that a kid with your specs might struggle a little to throw that around. But then again, you can always adapt to your skis...
I started off mounain biking with a 50lb clunker and moved up to a 30lb climber. Starting off on something much more cumbersome but in the end allowed me to control a lighter bike like it was nothing.
It's the athlete that makes the tools, not the other way around.