Based on your concluding sentence, your precepts are something like John Calvin, who said that our salvation or perdition is preordained by God, and nothing you can do will ever change your fate. All the good works you do won’t make a bit of difference.
If any part of you is still interested in happiness, then you might want to change or rearrange your basic assumptions. Off the top of my head I can only recommend listening to a Yes song titled “I’m Running.” If nothing else, just read the lyric. Even if you can’t be happy, remember that the future is about our children’s lives.