What if praying changes nothing and everything is predetermined?

Im not religious, not even sure I believe in god for various reasons but there are other unexplainable things that even science can't explain.

I've thought about this before but people always say god answers your prayers. Yet things only happen or don't happen based on the choices we make in life now. I could have the option to do two very different things tomorrow. Think "two roads diverge...". One option could lead me to fame and the other could ruin my life down the line.

People just pray to pray. Maybe it gives you motivation or something. If God knows everything that is to happen, wouldn't that make either choice we make and it's outcome predetermined?
What if praying changes nothing and everything is predetermined?
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