What is Past???

I wonder what is past. Does anyone know what is past? Hell, no..... I have a different perspective  in respect as to what is past. Past is something which can't be changed, a deep dark dungeon where there is may be happiness, anguish, sadness, anxiety, fear, and utmost only gloom and despair, a distant thing which never comes back. Is it so? Yes, sort of. I feel that past is only a very deep, dark and gloomy cavern in which if one enters, he/she can never come back. It's also a deep dark non-ending dungeon in which if one falls, can never even think of coming back. It is non-ending, it's depth is infinite. Any fool in his wildest dreams would not even like as to peep into that dungeon as it attracts evrything towards itself forcefully or by tempting him to do so like a black hole in our galaxy does. Everything, every passing moment, second or even a minute is a star that enters the black hole and disappears forever. One should never try to look deep into his past as it will fill him with great gloom and sadness as A Very Old Blend Of Alcohol intoxicates the human mind, body and soul disrupting it from thinking positively and helps enters a state of gloom, despair and sadness filled with remorse..... And further as such will cause him to attain a phase of great mental depression..................

              Even if I discard this cavern, dungeon or alcoholic theory, then I believe I would say, past is like an old tattered book with interiors full of dust and pages smeared with writngs in blood telling a story of sadness and gloom......

              In my opinion, the book of past should never be opened......

Don't try to change my past or

You will lose yourself......