I would say, definitely go to Canada, but don't let your relationship with this girl be the be-all-and-end-all of the trip. If it works out, great - you can have a wonderful time together. But if it doesn't work, just have an awesome time experiencing everything that Canada has to offer. Don't worry too much about the secrecy now, but once you're there, it's not fair if she continues to keep you a secret - it's not a balanced or fair friendship or relationship unless she's proud enough of you to make you an open part of her life. Be confident - she's lucky to have you - someone who's willing to go halfway around the world to see her. If she doesn't appreciate that, it's her loss, not yours.