I had the same problem when i started the game since i never played any survival before.
I wanted to play without any spoilers so I took my time instead and the game grow on me.

And since there is no mission in the game pointing me where to go I could play freely wich I like.

I started to love the atmosphere such as the weather and powerful thunderstorms in the game and the beuty of the sunset by the ocean even though the graphics is pixely.

Today I have over 1 k hour and the game still gives me some satisfaction even though it is not as fun as it use to be.
I guess 150-300 hours is kind of a normal rate to finish the game at the current state.