beam
Visual navigation is perhaps the hardest part of the PPL. I originally learnt in Scotland where it is very difficult not to be able to line up the map and the outside world. So doing - in this case the CPL - was a doddle really.
Down here in Blighty however most places are similar to most other places so it is difficult and stressful. Just accept it. Don't worry about whether everybody is better than you - you may have had some bad luck.
You have to remember that flying gets easier as you practice it, until a point comes when you can be quite relaxed. This is true of visual navigation. Just do some more dual trips and relax - you'll find you keep getting where you wanted even if some of the time you can't match ground features. Those turning points coming up on the nose, on time, will do wonders for your confidence.
There is no harm in using the GPS to get your initial heading and groundspeed (don't use the map if it has one - they're for children). This will give you confidence that your Dead Reckoning is ok. Then don't look at it again for at least 15 minutes. You are now safe unless until you get near controlled airspace - but as with your turning points - you can judge this by time (ie DR) rather than the map (pilotage). Once you realise this you can enjoy yourself looking out the window and funnily enough you will keep seeing things that relate to your map...