Whether you're off on an adventure for a good time, or a long time, you're going to run into one or two cultural speed-bumps and the worst thing that's going to happen? You'll learn and grow from those encounters.
From etiquette and behavior, to values and appearance; there's an array of differences that are both obvious and subtle when you travel abroad. The best way to handle anything is to be prepared. If you feel uncomfortable in unfamiliar surroundings and situations, do some research beforehand! Frequent some online message boards in the run up to your departure in order to get some tips from fellow travelers. Always remember to pay it forward upon your return.