How do i know if something is a sign

When is it God whos speaking to me?

I am afraid that I will see or hear things and interprete them the wrong way. (As this has happend in the past.) Where when I thought they were actual signs they were in fact not.

How do i know if that is God speaking to me or false information the devil gives me?

Tldr: I keep having this strong feeling something will turn out a certain. But how do I know that thats God speaking to me or not