It happens and nothing to be ashamed of. Thing is, an examiner will prod on when he spots a weakness. In your case it seems like this was airspace and charts.
On my latest checkride I very sure of myself went into a long spiel where I tried to convince my examiner that the CG of all aircraft is behind the center of lift! He should have failed me right there for such a fundamental mistake, but since it wasn't for the initial PPL he probably let me pass with the embarrassment of my error. In the air I proceeded to almost land with the gear up, couldn't answer how to exit a standard pattern, approached the wrong field, kept calling "radio" rather than "traffic" on the unicom etc, etc. It was a mess. Don't know how I passed.
It stings, but you'll get over it and become a better pilot for it. Get right back into it - it will help take the stigma out of it. Don't wait and let it stew. And when prodded, you'll find that you're in good company - many pilots have failed rides.