If you think traveling alone is dangerous and should not be done, I challenge you to read
The Art of Travel . Not only does this book examine the reasons you SHOULD travel, it encourages you to, even if you are by yourself. You will almost always meet up with others traveling alone, who are the same as you.
It is true that most people either travel with someone or not at all. What bad logic. Do you want to look back at all the things you "could" have done, but didn't?
I am a perfect example of that. Before my trip to Spain last year, I almost said "why bother", what can be so much better than where I live now?" I kind of didn't even want to go. But now that I visited Madrid and many other great cities, all I want to do is go back. I wouldn't even rule out living there someday.
So get off the couch, buy some plane tickets, and go have fun!