Purpose... Is it a Must for Surival?

Purpose... such a strong word. Purpose is the reason for an action being done, an object existing or being made or used. Purpose can be synonymous with the goal or the intended result of an action. It means to be here on earth for a reason. Something bigger than just existing. To go through life with out ever serving a purpose, without ever reaching out to someone to help them to me, is a wasted life time. So many are in need of someone to touch their lives and help them in some way. Many that have no idea how to ask. The rewards that come with helping someone, with knowing your purpose is immeasurable. For some... it is their only means to survive in this world.
This being said, what happens when you can no longer find your purpose? What changes in your world when the reason you got up every single morning leaves? And where do you go when even those around you don't truly need your help? They are totally able to care for themselves. Walking through life with a "care-givers" soul, it is difficult at times to find reason for even being, existing. The purposes we have in this world are what give us the motivation to get out of bed and start the day. It begins as soon as we open our eyes. We focus and even look forward to the day, existing with the knowledge that today... someone, somewhere is going to or already Does need you.
Suddenly, you wake one day and find yourself searching for that Purpose. Looking through your life and at those around you, you strive to reach into each one of them and find a Need. I knew for ever it seems what my purpose was. I reached out o so many and helped them along their journey through life. While I was helping them, they were also helping me in more ways than I knew sometimes. They were saving me while I was saving them. And some, sadly, I let down. I failed them as a friend and as someone they loved and cherished. Too busy with life and yet as mixed up as it sounds, I should have been busy with their life. My "Purpose" and I let them slip away, leaving them alone and without encouragement. When you surround yourself with people in need and suddenly that "need" is gone, where does that leave you???
The need to help someone, the desire to have purpose I think is a survival mode inside. I don't know if everyone has it with in them. Perhaps there are those that can survive without a real purpose. What I know is this. people are placed in our lives many times for a reason. A Purpose, They come into our lives, sometimes only for a season. When the purpose for them being in our lives is found and that purpose has been fulfilled, they may simply move on. But forever, they are embedded, bonded to your life and memory for the rest of your life. Someone else will fill their spot or you, will fill a spot in someone else's life. The blessings filling your life with a reason to be.
When you suddenly wake and realize you don't know what your purpose is, it is a terribly frightening place to find ones self. It can absolutely leave you feeling worthless. The search goes on to find my purpose in this world that surrounds me. I truly hope that I find it soon, before it destroys me and my world.