Whilst that amount per day may be quite suitable for a 'medium' low carb diet - it could be all in chocolate, fruit, porridge. You need to give us a bit more info.
Apart from the debatable benefits of low carbing, the single benefit for a T1 is that the lower the carbs, the lower the insulin requirement and the less extreme any side effect from over/under dosing. EG if you are eating a 50g meal and miscalculate by 50% (not difficult if you don't know what's in the meal precisely) you would be risking spiking if you don't take enough or a hypo if you take too much.
FWIW as an old geezer with no energy I limit myself generally to 80-100g per day. If I were an energetic 15yo I suspect things would be different. You may need advice on what to eat to give you the energy but not at the expense of high carbs.