Purpose in life or just existence?

It is times like this that make me understand why some people just check out of life. I am in a limbo, merely breathing and going through the motions, doing what is expected of me without any passion or personal fulfilment or achievement. Makes me wonder about this extremely strong push by success gurus and the Bible on knowing your purpose and living a life aimed at fulfilling it. What if there is NO purpose - we just exist, fighting to survive, be king of the hill and enjoy the spoils? What if Darwin was right - life is just a fight of the fittest and those who lose fade away, insignificant and very quickly forgotten? The winner? Well he enjoys the spoils of his victory for a season and then he too disappears buit with a smile on his face, not like the other guy who goes into oblivion sad, depressed and downcast. The only difference is when and how we make our exit.
I am just so tired and angry at my present condition, i.e. my life. It feels like its always a battle, one that I very rarely win. I'm forever in lack and 'no money' has become the monster crusher that breaks into a thousand spliners all my plans, hopes and dreams. I am left with a few strands of dreams and plans that wither in my hand, leaving me hopeless and angry. Will I ever be able to make enough to cover all my needs and fund all my dreams and projects or will I be one who will die unfinished. My epitaph will read: He dreamt and started but could never finish. His life was an unfinished work (due to lack of funds).
My work sucks - useless administration work and exercises that have no eternal value - and I have lost almost all my enthusiasm here. There is no friendship and comradrie here with any one - some casual acquaintances - and I feel all alone, left to do my load with no one concerned or willing to help until I make a mistake. Then many are interested, come to gently rebuke and offer ""You cannot do that" or"You are in trouble" advice which makes me wonder where they were and what they were doing when I began my journey towards my mistake. The work environment and collegues are not condusive for success or for feeling well. Another minus at this place of work.
Just exist or living for a purpose? At the moment is just striving to make it to the end of the day without reaching my end . . .