I'm not using any mods yet, I'm still very new to this game :3
When I spawned into the world I spawned in the middle of a giant desert that's completely barren so I travelled very far to find a more suitable location
Also I think I figured out what the problem was. I was too close to ruins, maybe? Cuz every time I walked away from my base, the sanity wheel started spinning up and when I got back to base it very quickly dropped to 0%
There are 5 different little ruin thingies around my old base. I'm assuming they're what caused the issues cuz ever since I moved to a new location, my sanity is no longer going down :3
I made sure to turn off temporal storms in the settings when creating the world but was there maybe a way to turn off monster spawning as well?