i think a lot of regret comes from continuing to do actions or spending time with certain people/at a certain place they know they shouldn't. continuing to do these things you know are detrimental to you have a compounding effect on your psyche. it's imperative that you are cognizant of what's happening to you and around you and then acting on this information. do not remain passive. you can't control what happens, but you do control your reaction.
Canada