Does Buddhism say that you/everything does not exist?

I'm at the end of my rope mentally on this topic and I figured I try here. The question is based on another one I asked on the main philosophy thread: https://philosophy.stackexchange.com/questions/136116/does-buddhism-say-that-you-are-everything/136136?noredirect=1#comment440151_136136 I don't know if you can read the medium article but the short version is that the guy says you don't exist/ nothing exists because nothing can exist in a void. That everything is dependent on something else and nothing has an independent existence. This leads him to then say everything is one, or something like that. I quoted the relevant segment in the thread. When I ask others I get various responses, like saying "everything is one" is a misunderstanding of the teachings, to saying that dependent arising doesn't mean nothing exists. I don't really get it. If you read the comments in the medium article I'm not sure they get it either. The whole thing has me seeing life as pointless, because if nothing exists then there is nothing to do. It's got me apathetic to myself, people, things, because none of it "Exists" and it's all one. I've met others who don't feel or think this way but I really don't know how else to look at it. I mean if "I" and others don't exist then it doesn't matter what happens to me or other people right? I just don't understand, I'd appreciate explanations in the simplest way you can put it if it's possible. I've been in and out of Buddhism for years and I just cannot grasp what the teachings say, let alone when others interpret it.