Oddly Wired
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self esteem

You blame your failures on the world around you.

The self-serving bias refers to the tendency to attribute successes to internal factors and failures to external ones.

Miller and Ross (1975) questioned the 'self-serving' nature of this bias, arguing that it may simply reflect that people expect to succeed and thus attribute unexpected failures to external causes.

You are a natural apologist for your own mistakes.

Where this comes from

Study
Miller and Ross, 1975, Psychological Bulletin
What the check found
The definition is standard in psychology, but the cited study itself was an investigation into whether the phenomenon is an artifact of expectations rather than a motivated defense mechanism.
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.