The carb count for your oatmeal is for a very large serving size - most boxes I have seen here give a serving size as 1/3rd cup (dry) and a carb count of 17 and 3 fibre.

I have oatmeal for breakfast about 4 times a week. I eat 35-50 carbs a day though. I use 1/4 of cup oats (about 10 net carbs), 2 tablespoons of wheat bran (2 net carbs, and 6 carbs fibre!) and 1 cup of water - boil, add cream and sweetner and eat.