I like a lot of what you said in this post. However, and no offense, it does show some scientific ignorance.
I'd recommend reading Lawrence Krauss' 'A Universe From Nothing' book, or watching the lecture of the same title (it's on YT).
NOTHING is actually SOMETHING, at times. Scientists have figured out that the weight of a vacuum of nothing actually weighs something... in fact, IIRC, it actually *appears* to weigh more than the observable universe. They don't really know why.
The real point is, what we know of as nothing, actually has tiny fluctuations of energy popping in and out of existence all the time. Particles that form as a result of these fluctuations can even time travel briefly! And sometimes... these fluctuations of energy can grow extremely big, as in... to form a universe. When it comes to quantum physics, you CAN get something out of nothing!
I don't really agree with you that the universe has always existed... unless we're talking about the concept of "existence" always existing. Modern science has theorized to a great extent that there multiple universes, even an infinite number of universes, and thus, an infinite number of possibilities. So yes, something has always more than likely existed... somewhere. There were universes before ours, and there will be universes after ours. But our universe certainly has not always existed, and it certainly had a beginning... in fact the age of our universe is almost as certain as evolution is. We also know that the universe is expanding at a rapid rate, and eventually everything will be so far a part that everything will "vaporize", and there will be an absolute nothing once again. This will simply lead to more universes arising from that bubbling ooze of quantum energy fluctuations.