As I can remember from several Buddhism texts that I’ve read, the past had already behind us, and the future still in question mark, then we should live in the present.
So from now on, I will not be bothered by my past life, I don’t need to worry about my future life, I will just enjoy my present life. I will appreciate every moment in my present life, no matter whether it is a worst moment or a best moment.
If there is no “worst”, then there is no “best”.
Sounds confusing ? :D