So what you are now doing is facing the fears of getting lost. You know that a road goes two directions. You can always backtrack if need be.
Right now are sitting there scaring yourself with everything that can go wrong before you even find out if your fear is realistic. So learn to read maps and use a GPS. You can practice those skills close by in the area you now live in. You do not have to wait until you are out on the road. If you were in the military you would learn them in boot camp before you were ever sent out to the troop you got assigned to. These things are not the major obstacles you are making them out to be.
So what you need to learn RIGHT NOW is a behavior modification technique to shut off then endless stream of anxiety that you are getting wound up in. That technique is super simple. When you start on the path of endlessly scaring yourself just tell yourself...STOP, ENOUGH. It is no different than when you have someone get in your face telling you that you must do this or must do that and you are sick of them ordering you around. You tell them to put a sock in it. But people don't realize you can tell your own inner voice to knock it off and quit bugging the hell out of you. Back off your own self, your own thoughts by saying ENOUGH because that is the person who is getting in your face causing you to be stressed out. It takes a bit of practice but you can learn to do it. This method was taught to me by a professional counselor 40 years ago. The method works and I have used it during many of the stressful times over the years to back off the self induced anxiety and self induced retributions or situations where I have had to deal with abusive individuals that I could not get out of my head. It is so easy to get wound up into those endless tracks but you do have a powerful weapon to shut off that dripping faucet of thoughts in your head. Just tell it STOP over and over until it stops. The more you do it the faster the response time to it gets. Like everything it takes practice until you train your brain to respond to commands, movements, situations etc.
This is part of learning self control. Everyone has to learn these things about self talk or they won't be able to achieve what they want to do. Be it a business executive, a policeman, a parent, a soldier, a mechanic, a janitor, a surgeon. There will always be things that make us nervous and things that are unpleasant that we simply have to get through and become comfortable doing. You can talk yourself down and get off that endless track of worry such as getting lost or being alone. You can find your way around to new places and you can do it alone. These two things will become very normal to you. Trust in that and talk yourself down off the worry treadmill that leads to nowhere.