It sounds like it's just your nerves playing up Venus. Prague's a great city, I am sure you'll love living there once you've settled in!

I went to visit there for a week... and honestly I think every morning I got up earlier than my friends and left the hostel to go and stare at the Astronomical Clock. It's my favourite structure ever I think.

Try to focus on the things that you'll like about living in a city - food! shopping! various places to wander around! history! Whatever floats your boat.

Coming from someone who's made some huge moves on my own... it can be scary. And there's always the what if's.... But they'll wear off the longer your there, because you'll develop your own routines and different places will become familiar to you and you'll start to feel safe and comfortable in those areas. It's just a bit scary until those things start to happen.