I'd know my life before I had even lived it

Girl: "I've made my decision, Father".

Her Father: "You've ruined so many prospects, Lucy".

Girl: "Hmm.Nothing but boys, following in their father's footsteps. I'd know my life before I had even lived it".

Is this sentence (I'd know my life before I had even lived it) past or imaginary present? If it is past then why aren't we saying "I knew my life before I had even lived it"? What does "would" mean here?

Here is a link http://www.springfieldspringfield.co.uk/movie_script.php?movie=savannah

It's from a movie 'Savannah'

Solution 1:

This is a conditional tense. I am not a grammar expert but I have seen this particular example called "present unreal conditional". However to understand why you have to realise that the condition is implied and is not actually present in the text:

"[If I had married one of them] I'd know my life before I had even lived it"