I will leave the words "shitty ex" here and let you paint the rest of the picture. Nothing amps up your anxiety more than someone constantly piling on you for being wrong and never telling or teaching you how to do it right.

5-minute howto's just catalyse that.

True story: My parentals never let me near anything that was meant for public presentation, so when I was finally trusted with something for a big public gathering, I was 100% trembles and anxiety. I even screamed when I accidentally dropped a piece.

Fortunately the people with me helped me conquer that fear.