The past is indeed a part of one's life. Everyone has a past either bad or good. Bad times often haunt our footsteps to move forward in order to achieve a better life. The thing to do is when having a bad past, try to have a high spirit of reaching for a better future life. Do not let the bad past happen again. Precisely it can be a lash to be more active and eager in achieving a brilliant future.
People who just regret what has happened will not be able to rise to achieve a better life. Everyone has a chance to change better than ever. Maybe it is not easy when through the phase of change from bad to good. However, in order to get a better future, you do not have to worry about it. Step with a steady heart. You need not look at everyone who belittles you for a mistake you made in the past. Man is a sin. When he is able to become a better person than ever, believe that Allah SWT has prepared His best place.