It says in A Course In Miracles:
A miracle is never lost. It may touch many people you have never met, and produce undreamed changes in situations of which you are not even aware.
And we never know, do we, the ripple effects that our acts of kindness and love have? They radiate out and the world is a better place. God's creation experiences joy that there is heaven on earth.
So go about your life with kindness and joy in your heart and even though you may believe it makes little difference our faith tells us that it is very significant, very important. It is first of all important to you because you are fulfilling your true purpose in life, and secondly it is very important to all who experience the postive karma which has been dispatched to people and places not even imagined nor intended.
Keep the faith and be a miracle worker even with no apparent immediate effect. Ya never know!