Hardly depressing. He's going to be a king, he's known that from the minute he was capable of understanding.
Yes he'll do those things, but he'll have immense wealth, will never ever need to worry or even think about money, move in the highest social circles, have fantastic properties available to live in, be able to travel the world. He will have handed to him all the material privileges, multiplied many times over, that people wish for their children.
He can also do many of the things that he might want to do as hobbies. Fly a plane, do various sports, climb mountains, be an artist, write poetry, play the stock market, play any musical instrument.
Ok the country may lose in him a potentially brilliant surgeon or hugely inspiring teacher, but he'll be absolutely fine. He's been trained from birth for the life he'll lead.
There is a choice, it's a hard one but it's there and has been done already by Edward VIII.