Have not felt this bad in years, got quite a depression. Seems as though i'm getting a lot of things wrong by jumping to assumptions that i believe to be true but turn out not to be the case.
Yeah, that can be an extremely hard habit to stop yourself from doing. Especially when your depressed mind is stuck in worrying mode.
There are many self-help books that help with stopping your mind from jumping to conclusions though.
You could find lots more online.