Personally I wouldn't get so up tight about driving to unknown places, or driving far, or even parking.
Unknown places, you'll likely be more aware are drive better than around the roads you know.
Crap at navigation, get a sat nav, or a sat nav app on the phone, great little things, even if you're driving to places you kind of know, its a bit of a reassurance that if you do get lost its there, and you have that voice telling you where to go, just like your instructor done
Driving longer distances, you'll settle down in to it after a little while, you'll be surprised how quickly you settle in to it, longer drives on dual carriageways, motorways etc are generally easier and more relaxing than pootling around on the local roads to find your feet, you get up to 5th and 70 odd or whatever and then just take care of the space around you, on local roads you're 'driving' more, having to think more etc
Bay parking or even parking in general, you can generally wing it and just find somewhere to park that's not too tasking, there is always somewhere you can just pull forwards in to, or that gap that's big enough to get in to without getting too near other cars.
Just get out there and do it, quit fretting, you'll just make it seem worse than it is, just take care of what you're doing and your own space, let other drivers take care of their own, anyone that has been on the road for even a short time can see a newly passed driver a mile off, and most will probably hold back a little and expect you to do the odd weird thing.