Worries...

Two days after the explosions that happened in tube stations and on a bus downtown London I'm feeling better. This time, as far as I know (because it's been a looooong time that I don't read the paper or watch the news), only one person got injured and the bombs didn't explode completely. I don't know if the idea was just to frighten people or something went wrong. Either way, I got a little scared at all this. I just hope that this don't happen again when I'm there (highly unlikely).
I'm worried about immigration. Loads of people enter the country every day to work illegally, I'm just going to study for a year and because of people like them, people like me get sent back to their countries.
I'm worried about money. A lot.
I'm worried about being alone there right on the second week. My course doesn't start until August 22 so I still won't be hanging out with classmates. Talking about them, I wonder how old they will be.
I'm worried about understanding what they say. For me everything has to be perfect (perfect accent, perfect English) but it won't be like this. I know that most people go to London knowing not even half of what I know and things work out fine for them.
I'm worried about crossing the street!!! Will I remember to look right when, deep in my heart, I know left is more logical? (Come on! Most countries are like Brazil! Get real!)
I'm worried about getting on the wrong subway and ending up in Manchester!!!

It's fucking unbeliveable, but I'm leaving POA in one week!