The sugar in natural oranges or the juice is not something you have to worry about. Just make sure you don't get anything with added sugars or sweeteners.
The reason it is so high is because it probably takes about three oranges to make a serving of juice. Our bodies can recognize and digest the sugars in juice because they haven't been unnaturally separated from their surroundings, like chemically processed sugars.
To digest the processed sugars, the body automatically releases what nutrients it has in order to make it a recognizable and digestible food source. So as we eat processed sugar, our nutrient stores are gradually depleted.
One glass of orange juice a day is very good for you and you should keep drinking it. Grape juice has an even high amount of 40 carbs per serving. If you are worried about how many carbs you have a day for the sake of weight gain and loss, you can always water it down a little.