Very true and when you can’t forget about bad things done by you in the past and can’t move on, you have always low self-esteem,

Feeling alone.

Fail in relationship.

Fail in business and job.

Unclear future.

Fear of judge by others who knows you.

Lost confidence.

Poor memory.

Last and important its encourage you to do more bad things and bad habits.

Solution:- find mentor, being spiritual.