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Anyway, the bottom line is basically that you have nothing to worry about.

150 lbs is nothing to drop everything about and start dieting and excercising like crazy. I bet when you go through the main onslaught of your growth it'll stretch out. After all, as your bones grow taller you grow thinner, and sometimes its common for boys to pack on weight before a growth spurt. You should have seen me before I sprouted to 6'0" all of a sudden. I was so porky!

But honestly. 150 lbs is nothing