Actually, I'm gonna let you in on a little secret here: there are no facts.
Everything is just opinion, sometimes people share them widely, but the scientific method dictates that as long as there are tests that can be performed, nothing is fact.
If you can read this then your own existence is a fact.
Is it?
Or am I just the elaborate figment of another's imagination, merely feigning autonomy and abstract thought?
Even if you were you would still exist in some form.
I mean 'existing' doesn't imply any specific nature. All it implies is that something "is."
what that specific thing actually is is up to the person perceiving it and their perspective.
'Being' comes before definition and meaning. You have to at least 'be' before you can be something that is defined.