How do i get into this game?

I'm quite new to this game, only have like 20 hours in it from a few months ago then put the game down. I really wanna get into the game because it seems really cool but i just don't know how to start actually playing the game. it feels like i jut run around and do nothing useful before i run low on sanity and give up cause i can't get it back up. can someone guide me on what i should do to survive?