The ultimate prison is when G‑d locks you up. He doesn't need guards or cells or stone walls.
He simply decides that, at this point in life, although you have talent, you will not find a way to express it. Although you have wisdom, there is nobody who will listen. Although you have a soul, there is nowhere for it to shine.
And you scream, "Is this why you sent a soul into this world? For such futility?"
That is when He gets the tastiest essence of your juice squeezed out from you.
Frustration, like the first tzimtzum, is the great juicer of all creativity.

I didn't understand, how does my frustration help? Why would Hashem want that? And then what is the purpose of that? Then what?
I am experiencing exactly this! Feeling like my talents cannot be put to use or like my life is being wasted away. So I scream for help and ask why. I don't see how that does anything yet so far.