system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: I don't think the universe has to have a beginning or an end

It's hard to understand the concept of infinity since all that we know has had a beginning and likely will have an end. I understand the pursuit to know what started it all, but why does there have to be a beginning to everything. What if everything always has existed? I guess I'm conflicted. I know that scientific evidence points towards some cataclysmic event in the past that lead to an expanding universe, but I never hear any talk of an infinitesimal existence. Why is this not considered more as a possibility?
gpt
> why does there have to be a beginning to everything

The Big Bang is the problem.  We've got this thing that happened billions of years ago with no explanation to what caused it.  All we know is that the universe was some point mass and suddenly decided it wanted to be bigger.  

So this begs the question, what was before this?  Was the universe always just a point mass until something happened?  If so, what was that something?  What's going to happen in trillions of years if we keep expanding at this rate?  Is the universe in a cyclical expansion, contraction, bang, expansion series?  If so, what's causing that cycle?  And so on.

I think infinite existence is still considered in some circles, but the problem is that with the data we have it seems to suggest that there had to be some beginning and will eventually be some end.