When was that? Last time I tried it was a couple of years ago.
As for the difference, outside of Spain the conjugation of Vosotros (you, plural) isn't used, but speaking to strangers is much more formal. Also, there's a lot of vocabulary differences which can be confusing for non-native speakers.
Good luck with your learning, it's a great language :-)
Best thing would be to go to a Spanish speaking country for a holiday, once you've been forced to use it on strangers you'll loose your language anxiety and it gets much easier (I live in Spain and work in Spanish, I'm not very good, but also no longer worried about muddling through).