I wish you a nice trip, Camila. And lots of good opportunities to put you English to use, along with the experiences that comes with traveling (perhaps "travelling" since you are closer to the UK/Australia)...he hee. That is, to know people, new acquaintances, friends, cultures, new ways, new types of food.
And that kind of shock happens to domestic travelers as well, many people go from bigger cities to smaller ones or even small towns, they lower their guard and sometimes get unpleasant surprises. Conversely, when people come from those towns get in our capitols and have to negotiate the maze that they are, for example, one being in the southeast should leave home at least one and a half hour hour to get to some airport or bus station, one never knows!
As you said, nothing like some insight from people that have traveled or from the locals!
In fact, the best things we bring with us after a trip are the experiences, and the learning of how to adjust quickly!
Correction, not only English, but the languages that you master so well. Sorry for having been so English-centred!