Hello soulcalm17

[Paleophyte]

Changes in form/qualities is a sign of anything that have beginning.

Untrue. The set of integers is infinite, unbound and unending, yet you can count from one to the next with little difficulty.

For virtual particles: you just don't know yet the cause.

And you don't know that they are caused. The fatal flaw in the statement that "Everything has a cause." is that nobody has checked everything to see if that is true.

Of course it is impossible to see the beginning of universe, while we're stuck in present time.

Or it's possible that the universe is eternal and that the Big Bang is simply the furthest back that we can see with current technology.