Why presume its a "Who"?
Mark says -- "Because if not, did they make themselves?"
That is called an argument from ignorance. It is also special pleading -- how you avoid asking this same question about your supposed "who."
If you wanted an actual answer, you would have asked -scientists-. The fact that you did not, shows not only an argument from ignorance, but an argument from -willful- ignorance. I.e. you are willfully stupid and apparently proud of it.
"Do you believe they created themselves? And that the universe created itself in general?"
I'm going to post a second video which provides a very basic, simple introduction to Zero Energy Universe. If you are not willfully ignorant, then watch it. I should not hear back from you until the next hour.
https://www.youtube.com/watch?v=7ImvlS8PLIo
Every time some theist attributed some unknown phenomenon to a "who", they have been wrong every. single. time. Why would this be any different?
https://www.youtube.com/watch?v=bVusPTM0P9o