1) Your English is fine. If you never shared you weren't a native English speaker, I doubt anyone would have guessed.

2) Americans, with the exception of a few jerks, are relatively nice to foreigners. Your accent will also probably get you bonus points with the ladies.

3) Not so much Canada, but with a few exceptions America sucks when it comes to public transportation. Prepared to be disappointed. If you live in a city, you'll have the opportunity to try so many different types of foods from different cultures, your mind might be blown by it. Prepared to be wowed. Some cities have better scenes than others when it comes to art, music, food, etc., but since you're in college your classmates will probably be able to steer you to some pretty nifty places. America is very big, and while there is an underlying culture, different regions and different groups of people will have their own subcultures. If you ever have trouble navigating a social situation, just play the foreign card and more often than not, that almost immediately smooths things over.

America kicks ass. If you do decide to visit, you'll more than likely enjoy yourself here.

Off Topic Edit: You start your game campaign? How's it going?