You should start working-out, because drinking those protein shakes aren't going to do much good if you don't build your muscle. I'm sorta like you in a way I have a tendency to get only carbs, I not really that fond of sugar, and have to eat a lot to gain weight.

Work out, and then munch out, eat a lot of steak, fish, what not. You'll be more beefy that way and still able to eat the carbs, sugars.