Off the top my head, I can think of five different ways of saying that.
1.Everything is destined. 一切是命运注定的。
2.Whatever we do, we cannot change fate. 我们怎么做也不能够改变命运。
3.We are chess pieces of fate. (我们是命运的棋子/我们任由命运摆布)。
4.We are at the mercy of fate. (我们对命运的支配毫无反抗能力)。
5.There is no escape from . (我们不能逃避命运)。