Carson Kelly’s T-shirt was a gift from Cubs broadcaster Boog Sciambi, who went to his pals at Obvious Shirts with a request for a custom design. Kelly chose the message: Everything Hurts. When you’re a big-league catcher, that comes with the territory. ‘‘There’s never a time I feel like, ‘Oh, everything is great,’ ’’ Kelly said Sunday. ‘‘There’s a reason why I wear a shirt that says Everything Hurts. Usually, as a catcher, there’s always somethi…