You're right about the happy times becoming lost among all the bad memories we have. It helped me a lot to look through old photos of my childhood. I could see the struggling kid that I was back then, but there were in fact good times and good people too. They were a blessing in my life then and they still are today.
Nobody living can ever stop me
As I go walking my freedom highway.
Nobody living can make me turn back:
This land was made for you and me. (Woody Guthrie)