Oddly Wired
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ego

You sabotage your performance to protect your ego.

Self-handicapping is the tendency to create obstacles to your own success so you have a ready-made excuse for failure.

By placing hurdles in your own path, such as staying up late before a presentation, you ensure that failure reflects a lack of effort rather than a lack of ability. This shields your self-esteem from the possibility of innate incompetence. It preserves your perception of potential.

You prefer to be seen as lazy rather than incapable.

Where this comes from

Study
Berglas and Jones, 1978
What the check found
The definition is standard in social psychology. The provided reference material lacked the quote, but the claim accurately reflects the foundational 1978 paper by Berglas and Jones.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.