Oddly Wired
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self esteem

You create your own excuses before you even start.

Self-handicapping is the strategy of creating obstacles to performance to protect your self-esteem if you happen to fail.

In a 1978 study, participants chose to consume a drug that would likely impede their performance on a test because they were anxious about their ability. It is easier to blame the obstacle than to face a lack of skill.

Failing is easier when you ensure it was never your fault.

Where this comes from

Study
Berglas and Jones, 1978
What the check found
The definition is standard psychological theory. The attribution to the 1978 study is correct in external literature, though not explicitly confirmed by the provided excerpt.
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.