Ah yes, let me just step outside of space-time real quick and check my notes from before time existed. Maybe consult my pre-temporal diary? "Dear diary, today, in the void of absolute nothingness..." 🤦‍♂️ Look, if I had a nickel for every time this question came up, I'd have enough mass to collapse into a black hole.

Is there a reason for the amount of stuff that there is in the universe? All the matter and energy?

Assuming the universe is finite, why couldn't there be a universe comprised of just enough energy and matter to make say, a handful of atoms? Or 10x the amount of stuff that exists, even accounting for what's beyond the observable parts?

If the universe is finite, then what do you think are the implications of the quantity? Like even if some energy was converted into matter and vice versa, the total sum must be there.

Just before I start, i really don't know whether that's the correct subreddit for this post, so if you think it is inappropriate here, tell me in the comments.
Also, I am very new in cosmology and astronomy, therefore the whole theory may be bullshit, and for that tell me as well in the comments.

Yesterday, while i was reading "Brief Answers to the Big Questions" by Stephen Hawking, some weird theory came to my mind, about the origin of the universe and what was before that.
In the first chapter "Is there God?", he mentions that before the Big Bang happened, there was no time, no space and certainly nothing. (He also mentions the theory of negative and positive energy and how it adds up to zero.)

From what we know, black holes also have no time, however they do have a lot of mass and positive energy*. They have so much mass, that it curves the light, and if light or pretty much anything gets in them, it cannot come out.

My theory comes here, that universes are contained inside different black holes, and ours as well.
And that's the reason they contain so much mass. Also that's the reason why we cannot se before the Big Bang, because we were in a black hole.
In the beginning, it is said that the expansion of the universe was faster than the speed of light, meaning mass can travel faster than the speed of light. How did that happen? Could it be that our universe came out of a black hole and started expanding beyond?

I imagined it, like a sine wave. At the beginning, it's going vertical and after that it reaches a solid top, after that it compresses and enters a state of black hole and continues in the same cycle.
(However, I think this thing about the sine wave, is bullshit but felt sharing it)

I will say it again, i am very new in this thing, so please be easy with me :D
I really want to hear, what you think of this theory and if anyone thought of it, I will be more than grateful to learn about it.

* I am using the words "energy" and "mass" with a similar meaning, because of Einstein's E=mc^2