I wouldn't let it knock your confidence, it happens to all of us. I'd take some comfort in the fact that you were able to identify that things weren't going to plan and that you showed good airmanship by going-around
. Some things are just out of our control.
Just to add, I've noticed a warning on my flight guide for Shobdon...
Visiting pilots are warned that windshear may occur when the following conditions apply: Mountain wave accompanied by wind with a northern component.
Not sure what the conditions were on the day you visited, but windshear could well be the answer.