Lack of self-confidence:

People with low self-esteem often have little confidence in their abilities.  They may think they're doomed to fail again because they failed before.

 

Poor Performance:

Lack of self-confidence may result in making little or no effort toward realizing projects or goals.  But failures that result from a lack of effort are not a true reflection of a person's abilities.

 

Distorted view of self and others:

Some people won't give themselves credit for their accomplishments.  These people may think others look better in comparison.  They may also believe that things just happen to them - that they don't make them happen.

 

Unhappy personal life:

Negative people aren't fun to be around.  People with low self-esteem find it hard to develop close relationships.  The result may be a lonesome and unhappy personal life.

Sivulta http://www.walmsley.ca/self-esteem.htm