There's something in me as a human which is making me question what it is to be human and I haven't been able to find a satisfactory answer
I'm not sure there is an answer.
I think we are an assemblage of atoms with a finite lifespan - and that's it. I know it's not very inspiring, but it is what it is and it ain't what it ain't.
I know what you mean - when things are tough, it's easy to think "What's the bloody point?" The point is whatever you, personally, have decided it should be.
But that's just my take on it.
Life is amazingly precious - just the very fact of it.
You were dead for 13.5bn years - you beat enormous odds to get here at all (your parents had the genetic capability of producing trillions of distinct people - but you were the one who got the chance to live). Your life is the tiniest fraction of a moment in the lifespan of the universe - pretty soon (sorry!) you'll be off again to your natural state - being dead.
But you were here - a member of the most intelligent species that has ever existed on Earth (that we know of) living at the very best time to live in human history. The atoms that make you were born in the heart of a star that spewed out it's guts when it died.
You are the universe talking about itself. You are just amazing, truly - and inordinately privileged.
I know that's all a bit useless when you're buried under with worries, but I think we should all take a moment every now and then to think...."Wow! Fuck me....I'm alive"!