Hey Umeka, it's very kind of you to help your German friend.
well, about your question,
I don't really feel fear for traveling alone regardless of country and destination.
Guess it has something to do with our individual personality such as whether we like exploring new things or not. I personally love trying to visit by myself and experience the new world where I've never seen yet. Sometimes its easy stance brought me lots of troubles but still, I enjoyed all of them.
Including all kind of tough tasks like language, new people and environment where we can't expect what'd happen, I would call as 'part of great journey' and I'm certain that they will get you so incredible and memorable moment^^
Once you try, you'll know how great they are!
So, don't be afraid for going to journey alone. As long as you are alive, everything will be alright, my advice;) hihi
Madoka