He also talks about every day stuff - like supporting Cardiff Devils ice hockey team, taking part in his school concert and buying a Christmas tree with his dad and brother.
"I've just had 20 e-mails in a row," Sean told CBBC Newsround Online. "I've had them from Detroit, Nova Scotia, Tasmania and loads of other places.
"I don't know the people who have written to me, but they all seem very nice. It's just brilliant."