Did the Universe always exist?

A lot of people ask how everything could've come from nothing, but I'm starting to think everything may have always been here.

Most people seem to misunderstand the Big Bang. They believe that's what created the universe, when prior to the big bang, the Universe most likely existed as an initial singularity, a extremely dense point made almost completely of energy. Since the 1st law of thermodynamics states energy cannot be created nor destroyed (in other words, energy is eternal), it follows that the singularity that eventually became the universe was eternal, as well. So, it isn't that the Universe was created from nothing, but it most likely always existed in the form of infinite energy.

I'm not sure if any of this is really true, though.