Erasing Memories

There're some sad and bad memories I wish I would never have had.
However, whenever I was happier, the bad memories always came up with the pleasent ones too.
Maybe the problem is myself since I also can't help keep looking at the images that reminded me of the bad memories.
Also, there're something I wish I would never have known.
Maybe keep myself away from the realistic world is still better than seeing more and knowing more.
I don't like to compare and be compared. However, C'est la vie-this is such a good phase to just explain everything thing.