Those experiences are the things that make us who we are. Even injustice, pain, unpleasantness, etc., can make you a better person for having experienced it.
If I ever want to take a nice trip into the past. I go to thurs. 80's night at the Vinyl Club. I could dance to erasure and The Thompson twins until 2:30. Nice and temporary blast from the not-so-long-ago past.
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Mopst memories are painful. Why remember those. The ones that are pleasant, you don't forget