What does soul searching mean?

a few real good friends have told me lately i''m starting to mess up again and i need to do some soul searching.
where do i start? How do i do this?
Update: my lifehas gone back and forth with addictions. rebel without a clue.. yeah always have been. im starting to lose the people CLOSEST to me again. how do i fix me if im not even sure where exactly im broke
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