Sometimes, I do believe in fate, which is like a river and you are in it.

Your sentence was grammatically correct but this is how I would phrase it.

You can be onwork your way to the the left or right asif you want through your hard workchoose, but no matter how struggling you armuch you struggle, you still can't escape from this river because it is your fate.

It's easier to use "to struggle" as a verb here instead of struggling as an adjective.