Letting go..

Why is it so difficult to let go of things?
Why cannot we forget all the bad, the sorrows , the dark times?
Why do they keep coming back like nightmares?
Why does yesterday haunt today and make tomorrow unbearable?
Why the desire to cry?
Why the need to stay alone?
Why cannot it be all smiles and no tears?
Why is there no "delete the past" button ?
Why does the mind have to refresh what I don't really want to remember?
Why so many why's when all I wanna be is happy?

So many questions, absolutely no answer...
The journey is long and I am tired.. wanna rest..