No Name

I know I'm asking a lot
Forgive my persistence
But I want what I haven't got
Proof of my existence

Look up, what do I see
Mankind looking like me
And I know it's not because I am mankind's hero

At times, it's good to hide
Get swept along with the tide
But I've suddenly seen that I'm one big zero

No name, tell me, who am I?
What's my name?
What's my name?