Hello ,it is not 8 litres of water but minimum of 8 glasses of water is what doctors suggest.
daily water requirement is 60ml/kg/day.so,8 litres is more than required for you .
it is not harmful in this age group,but it would have been detrimental in old age people or renal failure patients,but anyways as you work out it wouldn't have caused any damage.
so,now anwards take water according to the above said formula,and more only if your thirst demands.
congragulations on the fact the you are taking care of your health by doing workout and drinking good quantites of water.
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