Just now I was looking at the stars for a while and now there is this existential dread deep inside me that I just do not understand anything about reality anymore.

Let's assume I'm made of everything that's somewhere in the entire universe then where did it all come from? Was it always there? If not then what it the origin of everything and why does it start to exist? It feels like I'll never be able to find that answer and it scares me to admit being limited to have just human knowledge and abilities that aren't enough to comprehend what's going on around me.