Nice and easy
You're not real.
Your birth certificate; why? Why does anyone need a certificate to prove they were born? You can run, jump, talk & scream, but something to look into is 'the strawman' that is the fictional you, created without your mother or father knowing, (pairents pay rent for you ( the pair who rents you)) and all this without you knowing.
Find your 'birth certificate' and you'll find that your name is printed in black ink, and in capital letters.
As life goes by, you'll get letters delivered, in that name, and of course you'll assume that's you, but it's not, although these letters will normally cost you money, sometimes (& hopefully not) even a court summons. But once again, it's not you.
So you do need to understand the difference between lawful, and legal initially. But to make this easy, read the following link, and learn: