7:48 p.m. on October 18, 2007 (EDT)
Mandy,
I will add a few comments as an ancient GreyBeard who grew up in a family that spent much time in the outdoors. Part of the problem is that we now live mostly in an urban environment and most people are not familiar with the "wilderness" that you see when hiking and backpacking. As VAL indicated, the urban environment can be really dangerous, too. Here in the SFBay Area, I sometimes have to wonder, while watching the 10 oclock news, why people are so concerned about the death and injury rate in Iraq when we hear of nightly drive-by shootings that kill a half-dozen people at a time and our roads are littered with crashed and burning cars and maimed bodies. Plus the many injuries and deaths of those who, like VAL put their lives on the line in burning and collapsed buildings to save the rest of us.
As has been mentioned in this website before, how risky and how actually dangerous an activity is depends on how well you are trained, how experienced you are, and how well equipped you are ("equipped" means more than how much gear you carry, it means how well you can use what you have, including your training and experience (as Aldous Huxley said, "Experience is not what happens to you. Experience is what you do with what happens to you.") While you have to beware of hubris and just generally becoming complacent through familiarity, you can learn to be comfortable with being alone and self-reliant in the hills and woods. I will assume you have read Thoreau, Muir, and a number of the other writers on being in wilderness. You may well learn, as I (and my father, mother, and sister, as well as my wife, Barb) did, to get great joy and excitement in being alone in nature ("alone" does NOT equate to being "lonely").
In my acquaintance, there are many women who go into the woods alone. Some take a dog as a companion (a well-trained dog can be an asset to anyone spending much time in the woods). Based on this, I do not believe that there is anything other than the way people, especially women, are raised in our current urban society. As several posters noted, many men are apprehensive about the strange noises and lurking dangers, as well as women. So part of it is knowing what the dangers and risks are and how to deal with them - precautions to minimize the risk and ways to deal with the dangers should they appear. Yes, you can break a leg somewhere where no one can find you (and, as described in the book The Last Summer, maybe not find the body of even an extremely experienced backcountry ranger for several years). But that can even happen in an urban environment (several recent cases around here where someone drove off a well-travelled road in an urban area into a ditch or brush and it took days to find them).
The fears that seem to be posted on this site most concern bears, with malicious humans in second place. Yet when I was growing up in the Arizona desert (in a tiny village on a reservation), our most deadly critters were rattlesnakes and scorpions (my sister almost died from a scorpion bite, though not out on the desert - rather, in the lab where she was working as a grad student, and it was a South American scorpion, not a native Arizona variety). When camping, we always made sure to shake out our boots in the morning to get rid of any scorpions and we looked around cautiously to make sure that there were no reptilians that had decided to share the warmth of our beds. Yeah, we had critters like coyote (we knew the coyote as "Little Brother"). And when we went to the higher elevations in the northern part of the state, we had puma and bear. But somehow, we never had trouble with them, just the rattlers and scorpions. My sister likes to tell the tale of how I started to kill a scorpion by stomping on it - in my bare feet. She yelled for our mother who prevented me from doing this. It was later that I got my rattlesnake bite. But that's another story (snake died, by the way ... yes, for real, not a joke).
Point is, over the years, I gained experience, mostly by having good mentors. And now I, and many of my friends, head into the hills by myself, summer and winter, clear weather and blizzard. I have learned the risks and dangers and developed skills and experience, and I observe my limits. And, very important, I choose my locations and times. That time alone with Nature is important, precious, and exciting.
Again, it has nothing to do with whether you are a man or woman. It has everything to do with how you approach the environment you are in. Frankly, I am much more uncomfortable with many cities than in the woods.
Having said that, if a particular environment makes you uncomfortable, the thing to do is either stay away from that environment, or find a knowledgable and experienced mentor to lead you through developing the skills and experience. There are plenty of women who do venture alone into the wilderness and would be willing to help you. A couple of organizations that have women only programs to develop wilderness skills are NOLS (National Outdoor Leadership Schools) and the Appalachian Mountain Club. NOLS is based in the Rockies, and the AMC in New England. If you were into climbing, I would suggest Chicks With Picks, based in Colorado, if I recall correctly (the name implies ice climbing, but they do all sorts of mountaineering and climbing).