How much sugar?

Today, I went to Starbuck's to meet someone for coffee. I haven't been to Starbuck's for a long time, and didn't know what to order. So, I decided to try their Salted Caramel Mocha. With help from the barista, I ordered a decaf, Grande, and "half-sweet". It was really good!
However, by the end of the day, I felt so incredibly gross! Then I looked up how many calories and sugar grams were in one of those drinks...

OMG! 59 grams of sugar! Even though I ordered it half-sweet, I don't think it was less than 50 grams of sugar in total. That is more than what I'm supposed to have in one day! No wonder I felt so bad!